@article{Davies1989,
author = {Davies, J.B. and Shorrocks, A.F.},
title= {Optimal grouping of income and wealth data},
year = {1989},
doi = {10.1016/0304-4076(89)90078-X},
journal = {Journal of Econometrics},
volume = {42},
number = {1},
pages = {97--108},
}