Prepchuk, Ronald (1999-04-12). "How to Fix IntelliCAD"(PDF). Visio Corporation Confidential. Archived from the original(PDF) on 2009-11-27. Retrieved 2009-10-20.
Prepchuk, Ronald (1999-04-12). "How to Fix IntelliCAD"(PDF). Visio Corporation Confidential. Archived from the original(PDF) on 2009-11-27. Retrieved 2009-10-20.