@article{Vyas2006,
author = {Vyas, S. and Kumaranayake, L.},
title= {Constructing socio-economic status indices: How to use principal components analysis},
year = {2006},
doi = {10.1093/heapol/czl029},
journal = {Health Policy and Planning},
volume = {21},
number = {6},
pages = {459--468},
}