@article{article824f0ed1,
title   = {A nonlinear programming model with implicit variables for packing ellipsoids},
author = {Birgin, Ernesto Julian Goldberg and Lobato, Rafael Durbano and Martinez, J M},
year = {2017},
doi = {10.1007/s10898-016-0483-8},
journal   = {Journal of Global Optimization}
}