TY  - JOUR
A1  - Gittelsohn, J.
A1  - Shankar, A. V.
A1  - West, K. P.
A1  - Ram, R. M.
A1  - Gynwali, T.
T1  - Estimating Reactivity in Direct Observation Studies of Health Behaviors
Y1  - 1997
JF  - Human Organization
VL  - 56
IS  - 2
SP  - 182
EP  - -189

ER  -