HLINĚNÝ, Petr. Approximating the Crossing Number for Graphs close to "Planarity". In
Structure Theory and FPT Algorithmics for Graphs, Digraphs and Hypergraphs. Abstracts collection, Dagstuhl Seminar 07281. Dagstuhl, Germany: Schloss Dagstuhl GmbH, 2007, s. 6-7. ISSN 1862-4405.