Magnus Steinby Catalin Ionut Tîrnauca Syntax-Directed Translations and Quasi-alphabetic Tree Bimorphisms. 265-276 2007 conf/wia/2007 CIAA http://dx.doi.org/10.1007/978-3-540-76336-9_25 db/conf/wia/ciaa2007.html#SteinbyT07