1. On BE-algebras;Kim;Sci. Math. Jpn.,2007
2. On ideals and upper sets in BE-algebras;Ahn;Sci. Math. Jpn.,2008
3. On commutative BE-algebras;Walendziak;Sci. Math. Jpn.,2009
4. On generalized upper sets in BE-algebras;Ahn;Bull. Korean Math. Soc.,2009
5. A note on BE-algebras;Kim;Sci. Math. Jpn.,2010