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ACTA CYBERNETICA, 10 (3)., pp. 217-220.
DISCRETE APPLIED MATHEMATICS, 40 (2)., pp. 155-185.
ACTA CYBERNETICA, 10 (3)., pp. 141-153.
LECTURE NOTES IN COMPUTER SCIENCE, 646, pp. 71-85.
ACTA CYBERNETICA, 10 (3)., pp. 129-139.
DISCRETE APPLIED MATHEMATICS, 40 (2)., pp. 127-138.
COMPUTERS AND ARTIFICIAL INTELLIGENCE, 11 (2)., pp. 143-154.
DISCRETE APPLIED MATHEMATICS, 40 (2)., pp. 139-153.