Alpers, Werner MPI for Meteorology, Max Planck Society;
Hasselmann, Klaus F. MPI for Meteorology, Max Planck Society;
Alpers, W., & Hasselmann, K. F. (1978). The two-frequency microwave technique for measuring ocean-wave spectra from an airplane or satellite. Boundary-Layer Meteorology, 13, 215-230. doi:10.1007/BF00913873.