E. Rosyidi, A. Wibisono, R. Setiawan, N. P. Sugihartanti, J. P. Siregar, and H. S. Pratama, “Reducing reject cotter valve skyrocketing cylinder head parts in retainer Press Machine Process in the automotive industry”, OE, vol. 17, no. 1, pp. 59–68, Apr. 2025.