The supernova remnant W44: Confirmations and challenges for cosmic-ray accelerationM. Cardillo, M. Tavani, A. Giuliani, S. Yoshiike, H. Sano, T. Fukuda, Y. Fukui, G. Castelletti and G. DubnerA&A, 565 (2014) A74DOI: https://doi.org/10.1051/0004-6361/201322685
