@article{MZ_1974__137_172072,
     author = {Jorge Martinez},
     title = {Varieties of {Lattice-Ordered} {Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {265--284},
     publisher = {mathdoc},
     volume = {137},
     year = {1974},
     zbl = {0274.20034},
     url = {http://geodesic.mathdoc.fr/item/MZ_1974__137_172072/}
}