@article{10_4064_cm_33_2_161_173,
     author = {Guus Broesterhuizen},
     title = {A generalized {{\L}o\'s} ultraproduct theorem},
     journal = {Colloquium Mathematicum},
     pages = {161--173},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {1975},
     doi = {10.4064/cm-33-2-161-173},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-33-2-161-173/}
}