@article{10_4064_fm_73_1_21_27,
     author = {G. Gr\"atzer},
     title = {A reduced free product of lattices},
     journal = {Fundamenta Mathematicae},
     pages = {21--27},
     publisher = {mathdoc},
     volume = {73},
     number = {1},
     year = {1971},
     doi = {10.4064/fm-73-1-21-27},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-73-1-21-27/}
}