@article{IIMI_2012_1_a25,
     author = {G. G. Islamov},
     title = {On the question of extended convexity of {Green} operator},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {60--61},
     year = {2012},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2012_1_a25/}
}