. (2014). . Mathematical Culture and Thought, 33(2), 125-127.
. "", Mathematical Culture and Thought, 33, 2, 2014, 125-127.
. (2014). '', Mathematical Culture and Thought, 33(2), pp. 125-127.
, "," Mathematical Culture and Thought, 33 2 (2014): 125-127,
. . An Expository Journal of the Iranian Mathematical Society. 2014;33(2):125-127 (In Persian).
