@article{AFST_2010_6_19_S1_13_0,
     author = {Banaschewski, Bernhard and Hager, Anthony},
     title = {The $HSP${-Classes} of {Archimedean} $l$-groups with {Weak} {Unit}},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {13--24},
     publisher = {Universit\'e Paul Sabatier, Institut de math\'ematiques},
     address = {Toulouse},
     volume = {Ser. 6, 19},
     number = {S1},
     year = {2010},
     doi = {10.5802/afst.1272},
     mrnumber = {2675718},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/afst.1272/}
}