@techreport{Ridgeway2021,
author = {Ridgeway, G. and McCaffrey, D. and Morral, A. and Burgette, L. and Pane, J. and Griffin, B.A.},
title= {Toolkit for weighting and analysis of nonequivalent groups: A tutorial for the twang package},
year = {2021},
URL = {https://www.rand.org/pubs/tools/TLA570-5.html},
publisher = {RAND Corporation},
address = {Santa Monica, CA},
}