Baza dannykh i ︠i︡azyki programmirovani︠i︡a - Kogalovskiĭ, Mikhail Ruvimovich; Khrustalev, V. D. (Akademi︠i︡a nauk SSSR, ︠T︡Sentr. ėkonomiko-matematicheskiĭ in-t, 1989)