Czejdo B., Eick C.F. Integrating sets, rules, and data in an object-oriented environment // IEEE Expert.-1993.-v.8.-N 1.-P. 59-66.
Czejdo B., Eick C.F. Integrating sets, rules, and data in an object-oriented environment // IEEE Expert.-1993.-v.8.-N 1.-P. 59–66. 
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