@article{AM2_1990__39_2-3_137355,
     author = {V. Totik},
     title = {A conjecture of {Gy.} {Petruska.}},
     journal = {Aequationes mathematicae},
     pages = {261--263},
     publisher = {mathdoc},
     volume = {39},
     number = {2-3},
     year = {1990},
     url = {http://geodesic.mathdoc.fr/item/AM2_1990__39_2-3_137355/}
}