readings
- ross constraints
http://www-personal.umich.edu/~jlawler/aue/ross.html
- Long-Distance Dependencies without Island Constraints
http://www.cog.jhu.edu/howl-3/poster%20session/arnon.pdf
- Explaining Islands without Island Constraints
http://share.emmtee.net/pub/bscw.cgi/d63087/sag.21
- handout
http://www.stanford.edu/~tylers/notes/222b/Ross_constraints.pdf