Groß, V ; Reinke, C ; Kleemann, S... Gross V, Dittmar A, Penzel T, Schuttler F, von Wichert P. The relationship between normal lung sounds, age, and gender. Am J Respir Crit Care Med. 2000; 162:905-909..
,
2008
Sohrabi, AK ; Oertel, M ; Scharbrodt, V.. Kochaneck KD, Smith BL, Anderson RN. Deaths: preliminary data for 1999. NNSS (Bational Vital Statistics Report) 49. 2001, pp. 1-46..
,
2008