@article{article8448c764,
title   = {Packing circles within ellipses},
author = {Birgin, Ernesto Julian Goldberg and Bustamante, Luis Henrique and Callisaya, Hector Flores and Martinez, Jose Mario},
year = {2013},
doi = {10.1111/itor.12006},
journal   = {International Transactions in Operational Research}
}