@article{Pappas1993,
author = {Pappas, G. and Queen, S. and Hadden, W. and Fisher, G.},
title= {The increasing disparity in mortality between socioeconomic groups in the United States, 1960 and 1986},
year = {1993},
doi = {10.1056/NEJM199307083290207},
journal = {New England Journal of Medicine},
volume = {329},
number = {2},
pages = {103--109},
}