@article {IOPORT.50030063,
    author       = {Cibulka, Josef},
    title        = {Untangling polygons and graphs},
    year         = {2008},
    journal      = {Electronic Notes in Discrete Mathematics},
    volume       = {31},
    pages        = {207-211},
    doi          = {10.1016/j.endm.2008.06.041},
    identifier   = {50030063},
}