Raul Hakli Matti Nykänen Hellis Tamm Esko Ukkonen Implementing a Declarative String Query Language with String Restructuring. 179-195 1999 conf/padl/1999 PADL http://dx.doi.org/10.1007/3-540-49201-1_13 db/conf/padl/padl99.html#HakliNTU99