@article{JGAA_2017_21_6_a6,
     author = {Leah Wrenn Berman and Glenn Chappell and Jill Faudree and John Gimbel and Chris Hartman and Gordon Williams},
     title = {Graphs with {Obstacle} {Number} {Greater} than {One}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {1107--1119},
     publisher = {mathdoc},
     volume = {21},
     number = {6},
     year = {2017},
     doi = {10.7155/jgaa.00452},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00452/}
}