Burrill, G. F., & Hopfensperger, P. (1999). Exploring systems of inequalities. Dale Seymour Publications.
Chicago-čujuhus (17. p.)Burrill, Gail F., juo Patrick Hopfensperger. Exploring Systems of Inequalities. White Plains: Dale Seymour Publications, 1999.
MLA-čujuhus (9. p.)Burrill, Gail F., juo Patrick Hopfensperger. Exploring Systems of Inequalities. Dale Seymour Publications, 1999.
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