Luelsdorff Philip A. Luelsdorff 
Constraints on Error Variables in Grammar [PDF ebook] 
Bilingual misspelling orthographies

An in-depth investigation of constraints on error variables in grammar with special reference to bilingual misspelling orthographies. A corpus of errors is examined in minute detail. In the course of this analysis, received categories and standard assumptions about linguistic errors are critically scrutinized; some are sharpened, and others are abandoned. Many conceptual snarls having to do with the notion of error in linguistic performance are untangled in this book.