Lagrange extraction and projection for NURBS basis functions: A direct link between isogeometric and standard nodal finite element formulations - Schillinger - 2016 - International Journal for Numerical Methods in Engineering - Wiley Online Library
Lagrange Polynomials
Lagrange Interpolation - YouTube
Example Lagrange Basis Functions
LAGRANGE Function
Lagrange Polynomial Interpolation - Equation Help - Mathematics Stack Exchange