@article{FPM_2002_8_4_a6,
     author = {A. P. Levich and P. V. Fursova},
     title = {Problems and theorems of variational modeling in ecology of communities},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {1035--1045},
     publisher = {mathdoc},
     volume = {8},
     number = {4},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2002_8_4_a6/}
}