@article{KUIPM_1977_4_4_a5,
     author = {R. N. Abaidullin},
     title = {Operating system {SIGMA:} {Principles} of system organization},
     journal = {Issledovaniya po Prikladnoi Matematike i Informatike},
     pages = {35--39},
     year = {1977},
     volume = {4},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUIPM_1977_4_4_a5/}
}