HELM, M.S. “ON THE VALIDITY OF WEISSKOPF PHASE SHIFT IN THE PRESSURE BROADENING AND SHIFT OF SPECTRAL LINES”. Biological Sciences - PJSIR 37, no. 12 (June 9, 2022): 499–502. Accessed July 22, 2024. https://v2.pjsir.org/index.php/biological-sciences/article/view/2757.