@article{MZ_1966__94_170614,
     author = {Alfred L. Foster and Alden F. Pixley},
     title = {Algebraic and {Equational} {Semi-Maximality;} {Equational} {Spectra.} {II.}},
     journal = {Mathematische Zeitschrift},
     pages = {122--133},
     publisher = {mathdoc},
     volume = {94},
     year = {1966},
     zbl = {0199.32502},
     url = {http://geodesic.mathdoc.fr/item/MZ_1966__94_170614/}
}