共 15 条
[3]
Berger MS., 1972, J FUNCT ANAL, V9, P249
[4]
CLEMENT P, POSITIVE EIGENFUNCTI
[5]
DANCER EN, 1975, P LOND MATH SOC, V30, P76
[7]
Nehari Z., 1963, P ROY IRISH ACAD A, V62, P117
[8]
Polya G., 1951, ISOPERIMETRIC INEQUA
[9]
Rabinowitz P., 2009, EIGENVALUES NONLINEA