共 5 条
[2]
Arnol'd V I, 1975, RUSS MATH SURVS, V30, P1
[3]
GUSEINZADE SM, 1974, FUNCT ANAL APPL+, V8, P10, DOI 10.1007/BF02028301
[4]
ZEEMAN EC, 1975, S CATASTROPHE THEORY
[5]
ZEEMAN EC, 1977, CATASTROPHE THEORY 1