@article{MM_2002_14_3_a7,
     author = {O. V. Fel'dman},
     title = {Cycled indices of ecosystems},
     journal = {Matemati\v{c}eskoe modelirovanie},
     pages = {84--102},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MM_2002_14_3_a7/}
}