TY  - JOUR
A1  - Schmertmann, C.P.
T1  - Quadratic spline fits by nonlinear least squares
Y1  - 2005
DO  - 10.4054/DemRes.2005.12.5
JF  - Demographic Research
VL  - 12
IS  - 5
SP  - 105
EP  - -106

ER  -