@article{SM_1974_22_1_a0,
     author = {V. S. Vladimirov},
     title = {Holomorphic functions with positive imaginary part in the future tube},
     journal = {Sbornik. Mathematics},
     pages = {1--16},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1974},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1974_22_1_a0/}
}