@article{ZNSL_1997_236_a11,
     author = {N. Kehayopulu and J. S. Ponizovskii and M. Tsingelis},
     title = {The embedding of an ordered semigroup into an ordered group by means of pseudoorder},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {106--110},
     year = {1997},
     volume = {236},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_236_a11/}
}