中国科学院数学与系统科学研究院期刊网
JSSC
NONTRIVIAL PERIODIC SOLUTIONS OF A SEMILINEAR WAVE EQUATION WITHOUT ASSUMPTION OF MONOTONICITY
LI Shujie
NONTRIVIAL PERIODIC SOLUTIONS OF A SEMILINEAR WAVE EQUATION WITHOUT ASSUMPTION OF MONOTONICITY
LI Shujie
Journal of Systems Science and Complexity . 1992, (3): 193 -204 .