Eva Hajicová Ivana Kruijff-Korbayová Petr Sgall Prague Dependency Treebank: Restoration of Deletions. 44-49 1999 conf/tsd/1999 TSD http://link.springer.de/link/service/series/0558/bibs/1692/16920044.htm db/conf/tsd/tsd1999.html#HajicovaKS99