1. Chen Jin-de, Yu de-hong, Wang Yu-wei and Zhang Zigong, plastic precision cropping of metal materials, to be published.
2. 5th Int. Cold-Forgin Congr.;Gronostajski,1975
3. 5th Int. Cold-Forging Congr.;Das,1975
4. 5th Int. Cold-Forging Congr.;Lawson,1975
5. Cropping billets with low aspect ratios;Das,1979