TI  - ON the diagnosis of pregnancy in the early months
PT  - JOUR
DP  - 1989
TA  - JAMA
pages = {3468},
VI  - 261
IP  - 23
AID  - 10.1001/jama.1989.03420230122040 [doi]
4100  - http://dx.doi.org/10.1001/jama.1989.03420230122040
SO  - JAMA June 16, 1989 261(23):3468