8Hiroya Mochizuka,Shunichi Kusumi,Masami Mori and Nobuyuki Kobayashi.New Measuring Method of Contact Loss of Pantograph In AC Electric Railroads[J], IEEE 2000.
9Fumio NAKAMA,Matsutaro ICHIKAWA,Hiroki NAGASAWA.Measurement of contact loss by Detecting Spark[J], QUARTERLY REPORTS Vol.25 No 3 ,1984.
10O.Bruno, A.Landi, M.Papi, phototube sensor for monitoring the quality of current collection on overhead electrified railways[J], proceedings of the institution of mechanical engineers ,part F,2001.
