Policy on Intellectual Property Right (IPR)
1 The formula for the radio refractive index
2 Surface refractivity and height dependence
2.1 Refractivity as a function of height
2.2 Wet term of the surface refractivity
3 Vertical refractivity gradients
3.1 In the first kilometre of the atmosphere
3.2 In the lowest atmospheric layer
4 Statistical distribution of refractivity gradients
5 Surface and elevated ducts