@article{10_4064_fm_82_2_153_165,
     author = {Solomon Feferman},
     title = {Two notes on abstract model theory. {I.} {Properties} invariant on the range of definable relations between structures},
     journal = {Fundamenta Mathematicae},
     pages = {153--165},
     publisher = {mathdoc},
     volume = {82},
     number = {2},
     year = {1974},
     doi = {10.4064/fm-82-2-153-165},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-82-2-153-165/}
}