1. J.A.W. Hijink, A.C.H. van der wolf, On the Design of Die-Sets, Ann CIRP. 24 (1975) 357-360.
2. U.P. Singh, P.C. Veenstra, J. A. H. Remaekers, J.A.W. Hijink, Numerical analysis of four column under-drive press equipped with 4 guide pillar sub press, Sheet Metal Industries. (1976).
3. U.P. Singh, P.P. Miller, CAD of die-set, Proceeding of the 2nd Conference NMC. (1985).
4. U.P. Singh, H.J.J. Kals, A.H. Streppel, Computer aided design of a die-set for punching/blanking, Proceedings of 28th International MTDR Conference. (1990) 379-386.
5. U.P. Singh, H.J.J. Kals, A.H. Streppel, Design study of a punching/blanking tool geometry, Proceedings of IMC Conference. (1990) 806-820.