WITTEX: an innovative three-satellite radar altimeter concept. - R. Keith Raney; David L. Porter (IEEE Trans. Geosci. Remote. Sens., 2001)

Bistatic WITTEX: an innovative constellation of radar altimeter satellites. - Russell Keith Raney; David L. Porter; Francis M. Monaldo (IGARSS, 2002)

Abyss-Lite: improved bathymetry from a dedicated small satellite delay-Doppler radar altimeter. - R. Keith Raney; Walter H. F. Smith; David T. Sandwell; J. Robert Jensen; David L. Porter; E. Reynolds (IGARSS, 2003)