@article{Petrov2009global,
author={Petrov, V.G. and Papitashvili, V.O.},
title={Global Access to Geomagnetic data #x2013;  Concept and Implementation of a Virtual Observatory},
journal={Russian Journal of Earth Sciences},
publisher={Geophysical Center of the Russian Academy of Sciences},
year={2009},
pages={1-6},
volume={11},
issue={1},
}