@article{10_14708_ma_v31i45_04_1912,
     author = {A. Wiszniewska-Matyszkiel},
     title = {The operation of ecosystems and game theory. {II.} {Cooperation.}},
     journal = {Mathematica Applicanda},
     pages = { 56--77},
     publisher = {mathdoc},
     volume = {31},
     number = {45/04},
     year = {2003},
     doi = {10.14708/ma.v31i45/04.1912},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v31i45/04.1912/}
}