(2017). Bulletin of the Iranian Mathematical Society. (e1268). Bulletin of the Iranian Mathematical Society, 43(7), e1268

. "Bulletin of the Iranian Mathematical Society" .e1268 , Bulletin of the Iranian Mathematical Society, 43, 7, 2017, e1268.

(2017). 'Bulletin of the Iranian Mathematical Society', Bulletin of the Iranian Mathematical Society, 43(7), e1268.

, "Bulletin of the Iranian Mathematical Society," Bulletin of the Iranian Mathematical Society, 43 7 (2017): e1268,

Bulletin of the Iranian Mathematical Society. BIMS, 2017; 43(7): e1268.