Document Type : Translation
. (2009). . Mathematical Culture and Thought, 27(2), 39-42.
. "", Mathematical Culture and Thought, 27, 2, 2009, 39-42.
. (2009). '', Mathematical Culture and Thought, 27(2), pp. 39-42.
, "," Mathematical Culture and Thought, 27 2 (2009): 39-42,
. . An Expository Journal of the Iranian Mathematical Society. 2009;27(2):39-42 (In Persian).
