共 7 条
[1]
CHURCHILL RV, 1956, P C DIFFERENTIAL EQU, P235
[2]
COHEN DS, 1965, J MATH MECH, V14, P403
[5]
FRIEDMAN B, 1956, PRINCIPLE TECHNIQUES
[6]
LANGER RE, 1935, TOHOKU MATH J, V35, P260
[7]
Langer RE, 1929, T AM MATH SOC, V31, P868