@inproceedings{inproceedingse54b3db5,
title   = {Excitons trapped in impurities: the bounded-unbounded phase transition},
author = {Hornos, José Eduardo Martinho and Degani, Marcos Henrique and Hipólito, Oscar},
year = {1987},
publisher = {Sociedade Brasileira de Fisica},
booktitle   = {Encontro Nacional de Fisica da Materia Condensada}
}