AKBAR, SALIM. “?IMPACT OF COPPER VAPOUR CONTAMINATION ON ARGON ARCS?”. Biological Sciences - PJSIR 38, no. 9-10 (October 23, 1995): 379–383. Accessed July 22, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/2526.