@inproceedings{inproceedings17cb6835,
title   = {Solar observations: determination of the fundamental system and the orbital elements},
author = {Penna, J L and Benevides-Soares, Paulo and Andrei, A H and Laclare, F and Leister, Nelson Vani},
year = {1995},
publisher = {Union Astronomica Internacional},
booktitle   = {Reunion Regional Latinoamericana de Astronomia}
}