@article{UZERU_1988_2_a0,
     author = {N. Kh. Mesropian},
     title = {On a cosine of the angle between the {\textquotedblleft}past" and the {\textquotedblleft}future" of the process},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {3--7},
     year = {1988},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_1988_2_a0/}
}