Geodesic
The elementary definability and elementary characterizability of classes of reflexive graphs
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (1972), pp. 3-11.

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     author = {Yu. M. Vazhenin},
     title = {The elementary definability and elementary characterizability of classes of reflexive graphs},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--11},
     publisher = {mathdoc},
     number = {7},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1972_7_a0/}
}
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Yu. M. Vazhenin. The elementary definability and elementary characterizability of classes of reflexive graphs. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (1972), pp. 3-11. http://geodesic.mathdoc.fr/item/IVM_1972_7_a0/