@article{UZERU_2017_51_1_a4,
     author = {H. H. Khachatrian},
     title = {Deficiency of outerplanar graphs},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {22--28},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2017_51_1_a4/}
}