1. Methods of Spline Functions;Zavyalov,1980
2. A Practical Guide to Splines;de Boor,2001
3. Spline Functions: Basic Theory;Schumaker,2007
4. Spline Functions: Computational Methods;Schumaker,2015
5. Improving the speed of volumetric density map generation via cubic spline interpolation;Roe;J. Mol. Graph. Model.,2021