@article{MO_2011_3-4_a2,
     author = {P. Dolgirev},
     title = {On {Tangency} of {Conies} and {Straight} {Lines}},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {15--23},
     year = {2011},
     number = {3-4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2011_3-4_a2/}
}