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- On the filters generated in $poe$Γ-semigroups Far East J. Math. Sci. (FJMS) (2005), Vol 18, Pages 213-221
- Characterization of regular ordered $Gamma$Γ-semigroups. III Far East J. Math. Sci. (FJMS) (2004), Vol 12, Pages 291-298
- On minimal quasi-ideal elements in po$e$e-$Gamma$Γ-semigroups Far East J. Math. Sci. (FJMS) (2004), Vol 14, Pages 385–392
- Characterizations of regular ordered $Gamma$Γ-semigroups. II Far East J. Math. Sci. (FJMS) (2003), Vol 11, Pages 281-287
- Prime ideals in $Gamma$Γ-semigroups Far East J. Math. Sci. (FJMS) (2002), Vol 4, Pages 323-327
- Prime ideals in $Gamma$Γ-semigroups. II Far East J. Math. Sci. (FJMS) (2002), Vol 7, Pages 87-92
- A note on prime and semiprime bi-ideals in $Gamma$Γ-rings Far East J. Math. Sci. (FJMS) (2001), Vol 3, Pages 937-942
- Characterizations of regular ordered $Gamma$Γ-semigroups Far East J. Math. Sci. (FJMS) (2000), Vol 2, Pages 845-851
- A note on weakly prime ideals of ordered semigroups (Lee, Sang Keun) Math. Japon. (1999), Vol 50, Pages 243-246
- The characterizations of po-$Gamma$Γ-semigroups Far East J. Math. Sci. (FJMS) (1999), Vol 1, Pages 325-333
- On completely regular and quasi-completely regular ordered semigroups (Lee, Sang Keun) Math. Japon. (1998), Vol 47, Pages 247-251
- The left regular ordered $Gamma$Γ-semigroups Far East J. Math. Sci. (1998), Vol 6, Pages 613-618
- On the left right weakly prime ideals of $text{po-}Gamma$po-Γ-semigroups (Lee, Sang Keun) Far East J. Math. Sci. (1998), Pages 77-84
- On weakly prime ideals of ordered $Gamma$Γ-semigroups (Lee, Sang Keun) Commun. Korean Math. Soc. (1998), Vol 13, Pages 251-256
- A generalization of the theorem of Giri and Wazalwar (Lee, Sang Keun) Kyungpook Math. J. (1997), Vol 37, Pages 109-111
- The filters of the ordered $Gamma$Γ-semigroups J. Korea Soc. Math. Educ. Ser. B Pure Appl. Math. (1997), Vol 4, Pages 131-135
- On characterizations of right [left] semiregular po-semigroups (Lee, Sang Keun) Commun. Korean Math. Soc. (1997), Vol 12, Pages 507-511
- On left, right weakly prime ideals on po-semigroups (Lee, Sang Keun) Commun. Korean Math. Soc. (1996), Vol 11, Pages 315-321
- Some special elements in ordered $Gamma$Γ-semigroups. Dedicated to U-Hang Ki on the occasion of his 60th birthday (Lee, Sang Keun) Kyungpook Math. J. (1996), Vol 35, Pages 679-685
- Fuzzy $MGamma$Γ-groups (Jun, Young Bae; Park, June Won) Kyungpook Math. J. (1995), Vol 35, Pages 259-265
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