@article{SM_1975_27_2_a7,
     author = {V. S. Vladimirov},
     title = {Holomorphic functions with positive imaginary part in the future {tube.~III}},
     journal = {Sbornik. Mathematics},
     pages = {263--268},
     publisher = {mathdoc},
     volume = {27},
     number = {2},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_27_2_a7/}
}