M. Levy, Parabolic Equation Methods for Electromagnetic Wave Propagation, ser. IEE electromagnetic waves 45, IET, 2000.
DOI : 10.1049/pbew045e

J. R. Kuttler and D. G. Dockery, Theoretical description of the parabolic approximation/Fourier split-step method of representing electromagnetic propagation in the troposphere, Radio Science, vol.15, issue.3, pp.381-393, 1991.
DOI : 10.1029/91RS00109

M. A. Leontovitch and V. A. Fock, Solution of propagation of electromagnetic waves along the Earth's surface by the method of parabolic equations, J. Phys. URSS, vol.10, pp.13-23, 1946.

R. Janaswamy, Radio wave propagation over a nonconstant immittance plane, Radio Science, vol.8, issue.1, pp.387-405, 2001.
DOI : 10.1029/2000RS002338

A. R. Miller, R. M. Brown, and E. Vegh, New derivation for the rough-surface reflection coefficient and for the distribution of sea-wave elevations, IEE Proc. H Microwaves, Optics and Antennas, pp.114-116, 1984.
DOI : 10.1049/ip-h-1.1984.0022

A. Chabory, C. Morlaas, R. Douvenot, and B. Souny, An exact spectral representation of the wave equation for propagation over a terrain, ICEAA, 2012.
URL : https://hal.archives-ouvertes.fr/hal-01022309