@article{Graham2007,
author = {Graham, J.W. and Olchowski, A.E. and Gilreath, T.D.},
title= {How many imputations are really needed? Some practical clarifications of multiple imputation theory},
year = {2007},
doi = {10.1007/s11121-007-0070-9},
journal = {Prevention Science},
volume = {8},
number = {3},
pages = {206--213},
}