. (2012). . Mathematical Culture and Thought, 30(3), 87-99.
. "", Mathematical Culture and Thought, 30, 3, 2012, 87-99.
. (2012). '', Mathematical Culture and Thought, 30(3), pp. 87-99.
, "," Mathematical Culture and Thought, 30 3 (2012): 87-99,
. . An Expository Journal of the Iranian Mathematical Society. 2012;30(3):87-99 (In Persian).
