@article{ITA_2005__39_1_1_0,
     author = {Almeida, Jorge and Escada, Ana P.},
     title = {The globals of pseudovarieties of ordered semigroups containing $B_2$ and an application to a problem proposed by {Pin}},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {1--29},
     publisher = {EDP-Sciences},
     volume = {39},
     number = {1},
     year = {2005},
     doi = {10.1051/ita:2005001},
     mrnumber = {2132576},
     zbl = {1079.20074},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita:2005001/}
}