@article{10_21136_CPM_1990_108365,
     author = {Nebesk\'y, Ladislav},
     title = {On certain extensions of intervals in graphs},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {171--177},
     publisher = {mathdoc},
     volume = {115},
     number = {2},
     year = {1990},
     doi = {10.21136/CPM.1990.108365},
     mrnumber = {1054004},
     zbl = {0699.05045},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1990.108365/}
}