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Boumahdi, R., Kihel, O. and Mavecha, S. 2018. Proof of the conjecture of Keskin, Siar and Karaatli. Annales Fennici Mathematici. 43, 1 (Feb. 2018), 557–561. DOI:https://doi.org/10.5186/aasfm.2018.4328.