@article{1368b29f588b4821a83719bc06f5d169,
title = "Complex spectral variability from intensive multiwavelength mon itoring of Markarian 421 in 1998",
keywords = "BL Lacertae objects: general, BL Lacertae objects: individual (Markarian 421), X-rays: general, BL Lacertae objects: general, BL Lacertae objects: individual (Markarian 421), X-rays: general, BL Lacertae objects: general, BL Lacertae objects: individual (Markarian 421), X-rays: general",
author = "T. Takahashi and J. Kataoka and G. Madejski and J. Mattox and C.M. Urry and S. Wagner and F. Aharonian and M. Catanese and L. Chiappetti and P. Coppi and B. Degrange and G. Fossati and Hidetoshi Kubo and H. Krawczynski and F. Makino and H. Marshall and Harri Ter{\"a}sranta and T. Weekes",
year = "2000",
language = "English",
volume = "542",
pages = "pp. L105--L109",
journal = "The Astrophysical Journal",
publisher = "Institute of Physics Publishing",
}