@article{UZERU_2020_54_3_a0,
     author = {A. A. Chubaryan and A. A. Hambardzumyan},
     title = {On non-monotonous properties of some classical and nonclassical propositional proof systems},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {127--136},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2020_54_3_a0/}
}