@article{10_4064_fm_69_3_233_240,
     author = {G. Gr\"atzer and H. Lasker and C. Platt},
     title = {Free products of lattices},
     journal = {Fundamenta Mathematicae},
     pages = {233--240},
     publisher = {mathdoc},
     volume = {69},
     number = {3},
     year = {1970},
     doi = {10.4064/fm-69-3-233-240},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-69-3-233-240/}
}