Volodymyr Grimalsky Abel García Edmundo Gutiérrez Comparative Study of Two-Valley Models for Space Charge Wave Propagation in GaAs Semiconductor Films. 246-250 2005 conf/conielecomp/2005 CONIELECOMP http://doi.ieeecomputersociety.org/10.1109/CONIEL.2005.30 db/conf/conielecomp/conielecomp2005.html#GrimalskyGG05