@article{Wolfe1996,
author = {Wolfe, B. and Haveman, R. and Ginther, D. and An, C.B.},
title= {The ‘window problem’ in studies of children’s attainments: A methodological exploration},
year = {1996},
doi = {10.1080/01621459.1996.10476967},
volume = {91},
number = {435},
pages = {970--982},
}