"Masahiro Hotta,Miyuki HAYASHI,Michael T. Lanagan,Dinesh K. Agrawal,Kazuhiro Nagata","Complex permittivity of graphite, carbon black and coal powders in the ranges of X-band Frequencies (8.2 to 12.4 GHz) and between 1 and 10 GHz",,"ISIJ International","The Iron and Steel Institute of Japan","Vol. 51","No. 11","pp. 1766-1772",2011,Nov.