@article{VMUMM_1990_3_a19,
     author = {Vu Quoc Thanh},
     title = {Generalization of a theorem of {M.} {M.} {Gekhtman} for a nonlinear {Sturm--Liouville} equation},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {89--92},
     publisher = {mathdoc},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1990_3_a19/}
}