@article{MZ_1979__165_172792,
     author = {Stephen D. Comer},
     title = {The {Countable} {Chain} {Condition} and {Free} {Algebras.}},
     journal = {Mathematische Zeitschrift},
     pages = {101--106},
     publisher = {mathdoc},
     volume = {165},
     year = {1979},
     zbl = {0377.06008},
     url = {http://geodesic.mathdoc.fr/item/MZ_1979__165_172792/}
}