Jittinart Rattanamoong และ Tuangrat Chaichana. (2009) Cohen-Egyptian fraction and engel series expansions. Chulalongkorn University:ม.ป.ท.Jittinart Rattanamoong และ Tuangrat Chaichana. 2009. Cohen-Egyptian fraction and engel series expansions. ม.ป.ท.:Chulalongkorn University;Jittinart Rattanamoong และ Tuangrat Chaichana. Cohen-Egyptian fraction and engel series expansions. ม.ป.ท.:Chulalongkorn University, 2009. Print.