@book{fan1996local,
  added-at = {2016-02-16T18:28:35.000+0100},
  address = {Boca Raton, Fla.},
  author = {Fan, J. and Gijbels, I.},
  biburl = {https://www.bibsonomy.org/bibtex/2354d97776de31466f25794eb8cf20c58/krassi},
  interhash = {de68bea35adadb13da464f65107efce4},
  intrahash = {354d97776de31466f25794eb8cf20c58},
  isbn = {0412983214 9780412983214},
  keywords = {polynomial regression},
  publisher = {Chapman \& Hall/CRC},
  refid = {34917116},
  timestamp = {2016-02-16T18:28:35.000+0100},
  title = {Local polynomial modelling and its applications},
  url = {http://www.worldcat.org/search?qt=worldcat_org_all&q=0412983214},
  year = 1996
}
@article{akima:72,
  author={Hiroshi Akima},
  title={Algorithm 433: Interpolation and Smooth Curve Fitting Based on Local Procedures ({E2})},
  year={1972},
  journal={Communications of the {ACM}},
  volume={15},
  pages={914--918}
}

@article{akima:74,
  author={Hiroshi Akima},
  title={Algorithm 474: Bivariate Interpolation and Smooth Surface Fitting Based on Local Procedures [{E2}]},
  year={1974},
  journal={Communications of the {ACM}},
  volume={17},
  pages={26--31}
}

@article{akima:78,
  author={Hiroshi Akima},
  title={A Method of Bivariate Interpolation and Smooth Surface Fitting for Irregularly Distributed Data Points},
  year={1978},
  journal={{ACM} Transactions on Mathematical Software},
  volume={4},
  pages={148--159}
}

@article{akima:78a,
  author={Hiroshi Akima},
  title={ALGORITHM 526: Bivariate Interpolation and Smooth
Surface Fitting for Irregularly Distributed Data Points [{E1}]},
  year={1978},
  journal={{ACM} Transactions on Mathematical Software},
  volume={4},
  pages={160--164}
}

@article{akima:91,
  author={Hiroshi Akima},
  title={A Method of Univariate Interpolation that Has the
Accuracy of a Third-degree Polynomial},
  year={1991},
  journal={{ACM} Transactions on Mathematical Software},
  volume={17},
  pages={341--366}
}

@article{akima:91a,
  author={Hiroshi Akima},
  title={ALGORITHM: 697, Univariate Interpolation that has
the accuracy of a third-degree polynomial},
  year={1991},
  journal={{ACM} Transactions on Mathematical Software},
  volume={17},
  pages={367}
}

@article{akima:96a,
  author={Hiroshi Akima},
  title={Algorithm 760: Rectangular-Grid-Data Surface Fitting that Has the Accuracy of a Bicubic Polynomial},
  year={1996},
  journal={{ACM} Transactions on Mathematical Software},
  volume={22},
  pages={357--361}
}

@article{akima:96,
  author={Hiroshi Akima},
  title={Algorithm 761: scattered-data surface fitting that has the accuracy of a cubic polynomial},
  year={1996},
  journal={{ACM} Transactions on Mathematical Software},
  volume={22},
  pages={362--371}
}

@article{franke:82,
  author={Richard Franke},
  title={Scattered Data Interpolation: Tests of Some Methods},
  year={1982},
  journal={MATHEMATICS OF COMPUTATION},
  volume={38},
  pages={181--200}
}

@incollection{franke+nielson:91,
  author={Richard Franke and Gregory M. Nielson},
  title={Scattered data interpolation: a tutorial and survey},
  year={1991},
  publisher={Springer},
  address={Berlin},
  booktitle={Geometric Modeling: methods and applications},
  editor={Hans Hagen and Dieter Roller},
  pages={131--160}
}

@manual{hjelle:01,
  author={Øyvind Hjelle},
  title={Approximation of scattered data with Multilevel {B}-Splines},
  year={2001},
  institution={SINTEF Applied Mathematics, Oslo, Norway}
}

@article{leeetal:97,
  author={Seungyong Lee and George Wolberg and Sung Yong Shin},
  title={Scattered Data Interpolation with Multilevel {B}-Splines},
  year={1997},
  journal={{IEEE} TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS},
  volume={3},
  pages={228--244}
}

@article{renka:96,
  author={Robert J. Renka},
  title={Algorithm 751: TRIPACK: A Constrained Two-Dimensional Delaunay Triangulation Package},
  year={1996},
  journal={{ACM} Transactions on Mathematical Software},
  volume={22},
  pages={1--8}
}

@article{renka:98,
  author={Robert J. Renka},
  title={Remark on Algorithm 751},
  year={1998},
  journal={{ACM} Transactions on Mathematical Software},
  volume={24},
  pages={97--98}
}

@article{renka+brown:98,
  author={Robert J. Renka and Ron Brown},
  title={Remark on Algorithm 761},
  year={1998},
  journal={{ACM} Transactions on Mathematical Software},
  volume={24},
  pages={383--385}
}

@book{ripley:81,
  author={Brian Ripley},
  title={Spatial Statistics},
  year={1981},
  publisher={John Wiley \& Sons},
  address={Hoboken, NJ}
}

  @Article{rcpp,
    title = {{Extending         \cmd{R} with   \cmd{C++}: A Brief Introduction to   \cmd{Rcpp}}},
    author = {Dirk Eddelbuettel and James Joseph Balamuta},
    journal = {The American Statistician},
    year = {2018},
    volume = {72},
    number = {1},
    pages = {28-36},
    url = {https://doi.org/10.1080/00031305.2017.1375990},
    doi = {10.1080/00031305.2017.1375990},
  }

  @Manual{akima,
    title = {akima: Interpolation of Irregularly and Regularly Spaced Data},
    author = {Hiroshi Akima and Albrecht Gebhardt},
    year = {2021},
    note = {R package version 0.6-2.2},
    url = {https://CRAN.R-project.org/package=akima},
  }

 @Article{rcppeigen,
    title = {Fast and Elegant Numerical Linear Algebra Using the {RcppEigen} Package},
    author = {Douglas Bates and Dirk Eddelbuettel},
    journal = {Journal of Statistical Software},
    year = {2013},
    volume = {52},
    number = {5},
    pages = {1--24},
    url = {http://www.jstatsoft.org/v52/i05/},
  }

  @Manual{tripack,
    title = {tripack: Triangulation of Irregularly Spaced Data},
    author = {R. J. Renka and A. Gebhardt},
    year = {2020},
    note = {R package version 1.3-9.1},
    url = {https://CRAN.R-project.org/package=tripack},
  }

@article{sinclair:16,
author = {Sinclair, David},
year = {2016},
month = {03},
pages = {},
title = {S-hull: a fast radial sweep-hull routine for Delaunay triangulation},
url = {https://archive.org/details/arxiv-1604.01428}
}

  @Manual{mba,
    title = {MBA: Multilevel B-Spline Approximation},
    author = {Andrew Finley and Sudipto Banerjee and Øyvind Hjelle},
    year = {2017},
    note = {R package version 0.0-9},
    url = {https://CRAN.R-project.org/package=MBA},
  }

  @Manual{fields,
    title = {fields: Tools for spatial data},
    author = {{Douglas Nychka} and {Reinhard Furrer} and {John Paige} and {Stephan Sain}},
    note = {R package version 12.5},
    organization = {University Corporation for Atmospheric Research},
    address = {Boulder, CO, USA},
    year = {2017},
    url = {https://github.com/NCAR/Fields},
    doi = {10.5065/D6W957CT},
  }

@Manual{bivand:17,
title = {Alternatives to the \cmd{akima} package},
author = {Roger Bivand and Albrecht Gebhardt},
year = {2017},
series = {{useR!2017}},
url = {https://www.user2017.brussels/uploads/bivand_gebhardt_user17_a0.pdf}
}

  @Manual{interp,
    title = {interp: Interpolation Methods},
    author = {Albrecht Gebhardt and Roger Bivand and David Sinclair},
    year = {2020},
    note = {R package version 1.0-33},
    url = {https://CRAN.R-project.org/package=interp},
  }