@article{10_21136_CMJ_1972_101125,
     author = {Martinez, Jorge},
     title = {Free products in varieties of lattice-ordered groups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {535--553},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1972},
     doi = {10.21136/CMJ.1972.101125},
     mrnumber = {0311536},
     zbl = {0247.06022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1972.101125/}
}