@article{10_4153_CJM_1974_081_x,
     author = {Bleier, Roger D.},
     title = {The {SP-hull} of a {Lattice-Ordered} {Group}},
     journal = {Canadian journal of mathematics},
     pages = {866--878},
     year = {1974},
     volume = {26},
     number = {4},
     doi = {10.4153/CJM-1974-081-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-081-x/}
}