@article{IM2_2005_69_1_a7,
     author = {S. Yu. Tikhonov},
     title = {On two theorems of {Lorentz}},
     journal = {Izvestiya. Mathematics },
     pages = {163--175},
     publisher = {mathdoc},
     volume = {69},
     number = {1},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2005_69_1_a7/}
}