@article{10_4064_fm_73_3_219_233,
     author = {M. Makkai},
     title = {Svenonius sentences and {Lindstr\"om's} theory on preservation theorems},
     journal = {Fundamenta Mathematicae},
     pages = {219--233},
     publisher = {mathdoc},
     volume = {73},
     number = {3},
     year = {1971},
     doi = {10.4064/fm-73-3-219-233},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-73-3-219-233/}
}