@article{ADM_2012_13_2_a5,
     author = {Anthony M. Gaglione and Seymour Lipschutz and Dennis Spellman},
     title = {Survey of generalized pregroups and a~question of {Reinhold} {Baer}},
     journal = {Algebra and discrete mathematics},
     pages = {220--236},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2012_13_2_a5/}
}