TY  - JOUR
A1  - Watkins, S.C.
A1  - Warriner, I.
T1  - How do we know we need to control for selectivity?
Y1  - 2003
DO  - 10.4054/DemRes.2003.S1.4
JF  - Demographic Research
VL  - SC1
IS  - 4
SP  - 109
EP  - -142

ER  -