@article{10_4064_cm_48_1_1_5,
     author = {G. Gr\"atzer and S. Whitney},
     title = {Infinitary varieties of structures closed under the formation of complex structures},
     journal = {Colloquium Mathematicum},
     pages = {1--5},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {1984},
     doi = {10.4064/cm-48-1-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-48-1-1-5/}
}