@article{articlea7d44385,
title   = {Gaia Data Release 2 - Observational Hertzsprung-Russell diagrams★},
author = {Babusiaux, C and Van Leeuwen, F and Barstow. M. A and Jordi, C and Vallenari, A and Bossini, D and Souza, Ronaldo Eustáquio de and Teixeira, Ramachrisna},
year = {2018},
doi = {10.1051/0004-6361/201832843},
journal   = {Astronomy & Astrophysics}
}