REFERENCES
- Bulman-Fleming , S. , Laan , V. ( 2005 ). Lazard's theorem for S-posets . Math. Nachr. 278 : 1 – 13 .
- Bulman-Fleming , S. , Mahmoudi , M. ( 2005 ). The category of S-posets . Semigroup Forum 71 : 443 – 461 .
- Bulman-Fleming , S. , Gutermuth , D. , Gilmour , A. , Kilp , M. ( 2006 ). Flatness properties of S-posets . Comm. Algebra 34 : 1291 – 1317 .
- Bulman-Fleming , S. , Nasir , S. ( 2010 ). Examples concerning absolute flatness and amalgamation in pomonoids . Semigroup Forum 80 : 272 – 292 .
- Bulman-Fleming , S. , McDowell , K. ( 1984 ). Flatness and amalgamation in semigroups . Semigroup Forum 29 : 337 – 342 .
- Fakhruddin , S. M. ( 1986 ). Absolute flatness and amalgamation in pomonoids . Semigroup Forum 33 : 15 – 22 .
- Hall , T. E. ( 1978 ). Representation extension and amalgamation for semigroups . Quarterly Journal of Math. Oxford 29 ( 3 ): 309 – 334 .
- Howie , J. M. (1981). Epimorphisms and amalgamations: a survey of recent progress. Colloquia Mathematica Societatis János Bolyai, 39 Semigroups, Szeged (Hungary) , pp. 63–82.
- Howie , J. M. ( 1995 ). Fundamentals of Semigroup Theory . Oxford : Clarendon Press .
- Kilp , M. , Knauer , U. , Mikhalev , A. ( 2000 ). Monoids, Acts, and Categories . Berlin , New York : Walter de Gruyter .
- Shi , X. , Liu , Z. K. , Wang , F. G. , Bulman-Fleming , S. ( 2005 ). Indecomposable, projective and flat S-posets . Comm. Algebra 33 : 235 – 251 .
- Shi , X. ( 2005 ). Strongly flat and po-flat S-posets . Comm. Algebra 33 : 4515 – 4531 .
- Communicated by V. Gould.