X-ray response of STJ detectors using NbN absorbing layers by Parlato, L, Peluso, G, Pepe, G, diUccio, US, Cristiano, R, Espositio, E, Frunzio, L, Pagano, S, Akoh, H, Nakagawa, H, Takada, S, Gutsche, M, Kraus, H