@article{DAN_1989_305_2_a8,
     author = {I. G. Solovyev},
     title = {The method of comparison systems, based on input-output models, in},
     journal = {Doklady Akademii Nauk},
     pages = {291--293},
     publisher = {mathdoc},
     volume = {305},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_305_2_a8/}
}