@article{10_4064_fm_57_3_313_325,
     author = {M. Makkai},
     title = {A compactness result concerning direct products of models},
     journal = {Fundamenta Mathematicae},
     pages = {313--325},
     year = {1965},
     volume = {57},
     number = {3},
     doi = {10.4064/fm-57-3-313-325},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-57-3-313-325/}
}