@article{Smith2012,
author = {AB Smith and Y Oluboyede and R West and J Hewison and AO House},
title = {The factor structure of the GHQ-12: the interaction between item phrasing, variance and levels of distress},
journal = {Quality of Life Research},
year = {2012},
month = {Feb},
volume = {10.1007/s11136-012-0133-7},
url = {http://www.ncbi.nlm.nih.gov/pubmed/22350590},
}