@article{10_4064_cm_30_1_57_59,
     author = {G. Gr\"atzer and J. Sichler},
     title = {Agassiz sum of algebras},
     journal = {Colloquium Mathematicum},
     pages = {57--59},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {1974},
     doi = {10.4064/cm-30-1-57-59},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-30-1-57-59/}
}