@article{10_4064_fm_81_2_173_181,
     author = {I. Korec and M. Peretiatkin and W. Rautenberg},
     title = {Definability in structures of finite valency},
     journal = {Fundamenta Mathematicae},
     pages = {173--181},
     publisher = {mathdoc},
     volume = {81},
     number = {2},
     year = {1973},
     doi = {10.4064/fm-81-2-173-181},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-81-2-173-181/}
}