共 23 条
[1]
Ambrosetti A., 1993, REND SEMIN MAT U PAD, V89, P177, DOI DOI 10.1016/0165-0114(92)90069-G
[2]
[Anonymous], 2005, APPL MATH, DOI DOI 10.1007/S10492-005-0037-8
[4]
Coti-Zelati V, 1991, J AM MATH SOC, V4, P693