Holder, J., Hrabovský, M., Palatka, M., Schovánek, P. Observation of Mkn 421 with the CELESTE experiment. ISBN 1-56396-990-4. In: AHARONIAN, F., VÖLK, H., eds. High Energy Gamma-Ray Astronomy. Heidelberg: MaxPlanckInstitut für Kernphysik, 2001, s. 635-938. AIP Conference Proceedings., 558.