FURBERG B., NORDGREN L., and TAMMIVAARA-HILTY RITVA. “P-Wave Analysis in Chronic Obstructive Lung Disease With Pulmonary Hypertension”. Upsala Journal of Medical Sciences 77, no. 3 (September 1, 1972): 163-166. Accessed November 30, 2024. https://ujms.net/index.php/ujms/article/view/7447.