Robert Ganian, Thekla Hamm, Fabian Klute, Irene Parada, Birgit Vogtenhuber. Crossing-Optimal Extension of Simple Drawings. 48th International Colloquium on Automata, Languages, and Programming, ICALP 2021, July 12-16, 2021, Glasgow, Scotland (Virtual Conference) (Nikhil Bansal, Emanuela Merelli, James Worrell, eds.), volume 198 of LIPIcs, pages 72:1–72:17, 2021, Schloss Dagstuhl - Leibniz-Zentrum für Informatik.