Document Type : Opinion
. (2006). . Mathematical Culture and Thought, 25(1), 57-60.
. "", Mathematical Culture and Thought, 25, 1, 2006, 57-60.
. (2006). '', Mathematical Culture and Thought, 25(1), pp. 57-60.
, "," Mathematical Culture and Thought, 25 1 (2006): 57-60,
. . An Expository Journal of the Iranian Mathematical Society. 2006;25(1):57-60 (In Persian).
