@article{UZERU_2011_2_a8,
     author = {L. A. Haykazyan},
     title = {Decidability of $\Delta$-equivalence problem for monadic logic programs},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {50--54},
     publisher = {mathdoc},
     number = {2},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2011_2_a8/}
}