@article{DMGT_2012_32_2_a0,
     author = {Santhakumaran, A. and Titus, P.},
     title = {The vertex monophonic number of a graph},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {191--204},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2012_32_2_a0/}
}