Surat na di Toru

b Ida ma The Journal of Thoracic and Cardiovascular Surgery, Volume 134, No. 2, alm. 287-288; Texas Heart Institute Journal, Volume 38, No. 5, alm. 563; Basics of Blood Management, alm. 2; dohot Continuing Education in Anaesthesia, Critical Care & Pain, Volume 4, No. 2, alm. 39.