@techreport{Lanza2011,
author = {Lanza, S.T. and Dziak, J.J. and Huang, L. and Xu, S. and Collins, L.M.},
title= {Proc LCA & Proc LTA users' guide (Version 1.2.7)},
year = {2011},
URL = {http://methodology.psu.edu},
publisher = {The Methodology Center, Penn State},
address = {University Park},
}