@article{AL_2011_50_4_a5,
     author = {S. O. Speranskii},
     title = {Quantification over propositional formulas in probability logic: decidability issues},
     journal = {Algebra i logika},
     pages = {533--546},
     publisher = {mathdoc},
     volume = {50},
     number = {4},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2011_50_4_a5/}
}