@article{IM2_2001_65_1_a4,
     author = {Yu. G. Prokhorov},
     title = {On the classification of {Mori} contractions: the case of an elliptic curve},
     journal = {Izvestiya. Mathematics },
     pages = {75--84},
     publisher = {mathdoc},
     volume = {65},
     number = {1},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2001_65_1_a4/}
}