AU  - Manning WJ
TI  - MEthod of positive shadow differentiation
PT  - JOUR
DP  - 1929
TA  - Journal of the American Medical Association
pages = {646},
VI  - 92
IP  - 8
AID  - 10.1001/jama.1929.92700340003014b [doi]
4100  - http://dx.doi.org/10.1001/jama.1929.92700340003014b
SO  - Journal of the American Medical Association February 23, 1929 92(8):646