共 12 条
[3]
BELLEN A, 1979, RC 1 MAT U TRIESTE, V11, P32
[5]
Knobloch H.W., 1962, MICH MATH J, VN9, P303, DOI DOI 10.1307/MMJ/1028998768
[6]
Knobloch H-W, 1963, MICH MATH J, V10, P417
[7]
KNOBLOCH HW, 1971, J DIFFER EQUATIONS, V9, P67
[9]
Mawhin Jean, 1969, B SOT ROY SCI LIEGE, V38, P308