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1. , , . , 2005.
2. [ ]. : http://studopedia.su/16_48488_modeli-predstavleniya-dannih.html.
3. - [ ]. : http://www.mstu.edu.ru/study/materials/zelenkov/ch_6_3.html
4. - [ ]. : http://life-prog.ru/1_18472_i-ob-ektno-relyatsionnaya-modeli.html.