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- [1] LIE NILPOTENCY AND IDEALS OF THE CROSSED-PRODUCTS DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1984, 37 (11): : 1447 - 1449
- [3] CROSSED-PRODUCTS WHICH ARE RINGS OF THE PRINCIPAL IDEALS DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1987, 40 (01): : 17 - 18