@article{10_4064_am_19_3_4_413_441,
     author = {A. Gy\'arf\'as},
     title = {Problems from the world surrounding perfect graphs},
     journal = {Applicationes Mathematicae},
     pages = {413--441},
     publisher = {mathdoc},
     volume = {19},
     number = {3-4},
     year = {1987},
     doi = {10.4064/am-19-3-4-413-441},
     zbl = {0718.05041},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-19-3-4-413-441/}
}