Lam H., Su S.Y.W., Ruhela V. et al. GTOOLS: An active GUI toolset for an object-oriented KBMS // Computer Systems Science & Engineering.-1992.-v.7.-N 2.-P. 69-85.
Lam H., Su S.Y.W., Ruhela V. et al. GTOOLS: An active GUI toolset for an object-oriented KBMS // Computer Systems Science & Engineering.-1992.-v.7.-N 2.-P. 69–85. 
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