@article{AL_2018_57_5_a4,
     author = {A. T. Nurtazin},
     title = {Forcing formulas in {Fra{\"\i}ss\'e} structures and classes},
     journal = {Algebra i logika},
     pages = {567--586},
     year = {2018},
     volume = {57},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2018_57_5_a4/}
}