%0 Journal Article %A V. N. Pavlenko %A O. V. Ul'yanova %T The method of upper and lower solutions for elliptic-type equations with discontinuous nonlinearities %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1998 %P 69-76 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1998_11_a9/ %G ru %F IVM_1998_11_a9