是这篇吧,Generalized propensity score for estimating the average treatment effect of multiple treatments
Ping Feng1, Xiao-Hua Zhou2,3,4, Qing-Ming Zou5, Ming-Yu Fan6, Xiao-Song Li7,*
Article first published online: 24 FEB 2011
DOI: 10.1002/sim.4168
Statistics in Medicine