@article{UZERU_2005_2_a9,
     author = {A. H. Apinyan and I. E. Danielyan},
     title = {A dynamic model of the environment protection problem},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {139--141},
     publisher = {mathdoc},
     number = {2},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2005_2_a9/}
}