TY  - JOUR
A1  - Sharpe, F.R.
A1  - Lotka, A.J.
T1  - A problem in age-distribution
Y1  - 1911
DO  - 10.1080/14786440408637050
JF  - Philosophical Magazine
VL  - 21
SP  - 435
EP  - -438

ER  -