MAGIC TeV gamma-ray observations of Markarian 421 during multiwavelength campaigns in 2006 - Aleksic, J.; Anderhub, H.; Antonelli, L. A.; Antoranz, P.; Backes, M.; Baixeras, C.; Balestra, S.; Barrio, J. A.; Bastieri, D.; Becerra Gonzalez, J.; Becker, J. K.; Bednarek, W.; et al. (Astronomy & Astrophysics, 2010)