00491oas 2200181z- 450 99621221790331620190201001135.0(CKB)1000000000532976(DE-599)ZDB2038690-4(EXLCZ)99100000000053297620170515cuuuuuuuu -u- -engMiscelanea de la FisicaUniversidad Autónoma MetropolitanaJOURNAL996212217903316Miscelanea de la Fisica2262862UNISA