@article{DMGAA_2011_31_1_a1,
     author = {Phuapong, Sarawut and Leeratanavalee, Sorasak},
     title = {Pre-strongly solid varieties of commutative semigroups},
     journal = {Discussiones Mathematicae. General Algebra and Applications},
     pages = {27--45},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGAA_2011_31_1_a1/}
}