María Eugenia Castro Alfonso Niño Camelia Muñoz-Caro Heuristic computation of the rovibrational G matrix in optimized molecule-fixed axes. Gmat 2.1. 1471-1475 2010 181 Computer Physics Communications 8 http://dx.doi.org/10.1016/j.cpc.2010.04.016 db/journals/cphysics/cphysics181.html#CastroNM10a