1. High energy astrophysics with ground-based gamma ray detectors
2. Very High Energy Gamma-ray Astronomy;Weekes,2003
3. H.E.S.S. website. (section . . . ./hess2).
4. P.M.S. Blackett, in: Proceedings of the International Conference on the Emission Spectra of the Night Sky and Aurorae, held under the auspices of the Gassiot Committee of the Royal Society, London, July 1947, Physical Society, 1948, pp. 34–35.