Recommendation ITU-R P.1144-12
Policy on Intellectual Property Right (IPR)
Annex 1
1a Bi-linear interpolation on a trapezoidal grid
1b Bi-linear interpolation on a square grid
2 Bi-cubic interpolation
3 Gaussian quadrature integration
3.1 Single integral
3.2 Double integral
3.3 Algorithm to calculate Gaussian quadrature points (nodes) and
weights