To cite SK Package in publications use:

Song Y (2018). SK: Segment-Based Ordinary Kriging and Segment-Based Regression Kriging for Spatial Prediction. R package version 1.1.

Song, Yongze, Wang, Xiangyu, Wright, Graeme, Thatcher, Dominique, Wu, Peng, Felix and Pascal (2018). “Traffic Volume Prediction With Segment-Based Regression Kriging and its Implementation in Assessing the Impact of Heavy Vehicles.” IEEE Transactions on Intelligent Transportation Systems. doi: 10.1109/TITS.2018.2805817.

Song, Yongze, Tan, Yi, Song, Yimeng, Wu, Peng, Cheng, CP J, Kim, Jeong M, Wang and Xiangyu (2018). “Spatial and temporal variations of spatial population accessibility to public hospitals: a case study of rural–urban comparison.” GIScience & Remote Sensing, pp. 1–27. doi: 10.1080/15481603.2018.1446713.

Skoien, O J, Bloschl, Gunter, Laaha, Gregor, Pebesma, E, Parajka, Juraj, Viglione and Alberto (2014). “Rtop: An R package for interpolation of data with a variable spatial support, with an example from river networks.” Computers & Geosciences, 67, pp. 180–190. doi: 10.1016/j.cageo.2014.02.009.

Corresponding BibTeX entries:

  @Manual{,
    title = {{SK}: Segment-Based Ordinary Kriging and Segment-Based
      Regression Kriging for Spatial Prediction},
    author = {Yongze Song},
    year = {2018},
    note = {R package version 1.1},
  }

  @Article{,
    title = {Traffic Volume Prediction With Segment-Based Regression
      Kriging and its Implementation in Assessing the Impact of Heavy
      Vehicles},
    author = {{Song} and {Yongze} and {Wang} and {Xiangyu} and {Wright}
      and {Graeme} and {Thatcher} and {Dominique} and {Wu} and {Peng}
      and {Felix} and {Pascal}},
    journal = {IEEE Transactions on Intelligent Transportation
      Systems},
    year = {2018},
    publisher = {IEEE},
    doi = {10.1109/TITS.2018.2805817},
  }

  @Article{,
    title = {Spatial and temporal variations of spatial population
      accessibility to public hospitals: a case study of rural--urban
      comparison},
    author = {{Song} and {Yongze} and {Tan} and {Yi} and {Song} and
      {Yimeng} and {Wu} and {Peng} and {Cheng} and Jack CP and {Kim}
      and Mi Jeong and {Wang} and {Xiangyu}},
    journal = {GIScience & Remote Sensing},
    pages = {1--27},
    year = {2018},
    publisher = {Taylor & Francis},
    doi = {10.1080/15481603.2018.1446713},
  }

  @Article{,
    title = {Rtop: An R package for interpolation of data with a
      variable spatial support, with an example from river networks},
    author = {{Skoien} and Jon O and {Bloschl} and {Gunter} and {Laaha}
      and {Gregor} and {Pebesma} and {E} and {Parajka} and {Juraj} and
      {Viglione} and {Alberto}},
    journal = {Computers & Geosciences},
    volume = {67},
    pages = {180--190},
    year = {2014},
    publisher = {Elsevier},
    doi = {10.1016/j.cageo.2014.02.009},
  }