@article{DMGT_2014_34_2_a13,
     author = {Liu, Jinfeng and Wang, Xiumei},
     title = {A note on $PM$-compact bipartite graphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {409--413},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2014_34_2_a13/}
}