@article{KUIPM_1980_a13,
     author = {N. I. Zvyagina},
     title = {Kernel of the computer-aided instruction system {GAMMA}},
     journal = {Issledovaniya po Prikladnoi Matematike i Informatike},
     pages = {89--93},
     publisher = {mathdoc},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUIPM_1980_a13/}
}