Document Type : Translation
. (2011). . Mathematical Culture and Thought, 30(1), 33-37.
. "", Mathematical Culture and Thought, 30, 1, 2011, 33-37.
. (2011). '', Mathematical Culture and Thought, 30(1), pp. 33-37.
, "," Mathematical Culture and Thought, 30 1 (2011): 33-37,
. . An Expository Journal of the Iranian Mathematical Society. 2011;30(1):33-37 (In Persian).
