Klimpel V (2004). "Does Kehr's sign derive from Hans Kehr? A critical commentary on its documentation?". Chirurg. ج. 75 ع. 1: 80–3. DOI:10.1007/s00104-003-0796-2. PMID:14740133.
Klimpel V (2004). "Does Kehr's sign derive from Hans Kehr? A critical commentary on its documentation?". Chirurg. ج. 75 ع. 1: 80–3. DOI:10.1007/s00104-003-0796-2. PMID:14740133.