Helmut Horacek Magdalena Wolska Transformation-Based Interpretation of Implicit Parallel Structures: Reconstructing the Meaning of "vice versa" and Similar Linguistic Operators. 2006 conf/acl/2006 ACL http://acl.ldc.upenn.edu/P/P06/P06-2049.pdf db/conf/acl/acl2006.html#HoracekW06