TY - BOOK AU - Willem, Michel TI - Minimax theorems T2 - Progress in nonlinear differential equations and their appli SN - 0-8176-3913-6 U1 - 515.64/WIL PY - 1996/// CY - Boston PB - Birkhauser KW - Mathematical physics KW - Maxima and minima KW - Boundary value problems KW - Mathematics ER -