1. ARMAO, F. G. 1996.Low Cost High Volume Program-Summary of Investigation Conducted to Assess the Effects of Multipass/Multilayer Welding on Welding Distortion and Joint Mechanical Properties, 13–14. Pittsburgh: Aluminum Company of America. Unpublished
2. Technical Report 98-05;CHAKRAVARTHY K.,1998
3. Final Report Under Contract NAS8-21174;COLE D. Q.,1968
4. Heuristics for the Mixed Rural Postman Problem