@article{10_21136_CMJ_1976_101367,
     author = {Hulin, Adam J.},
     title = {Extensions of ordered semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1--12},
     publisher = {mathdoc},
     volume = {26},
     number = {1},
     year = {1976},
     doi = {10.21136/CMJ.1976.101367},
     mrnumber = {0392740},
     zbl = {0339.06010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1976.101367/}
}