Francisco J. Serón Diego Gutierrez Guillermo Gutierrez Eva Cerezo Implementation of a method of curved ray tracing for inhomogeneous atmospheres. 95-108 2005 29 Computers & Graphics 1 http://dx.doi.org/10.1016/j.cag.2004.11.010 db/journals/cg/cg29.html#SeronGGC05