Серебрянский, Ю., И. Староверов, Е. Бырихин, and Н. Ларионов. “Preventive Maintenance Pulmonary Embolism at Patients of a High Degree of Risk. Results of Various Tactical Approaches”. Bulletin of the International Scientific Surgical Association 3, no. 2-3 (May 8, 2008): 47-48. Accessed January 26, 2021. http://www.surgjournal.ru/index.php/BISSA/article/view/293.