1. (1) R. Honbo, H. Wakabayashi, Y. Murakami, S. Ueda, K. Kiyose, and N. Kato: “The Influence of Brush Contact Condition on Commutation Spark”, IEICE Trans. (C), Vol. J90-C, No. 7, pp. 557-566 (2007) (in Japanese)
2. 本保亮一・若林宏之・村上洋一・上田信司・清瀬顕三・加藤尚樹：「整流火花に与えるブラシ接触状態の影響」, 信学論(C), Vol. J90-C, No. 7, pp. 557-566 (2007)
3. (2) T. Fukutsuka, Y. Yokomizu, H. Asai, and T. Nozu: “Arc Discharge during Commutation Process in DC Motor Immersed in Ethanol: Approach to Contact State of Brush on Commutator Segment”, IEEJ Trans. PE, Vol. 139, No. 5, pp. 293-301 (2019) (in Japanese)
4. 福塚隆司・横水康伸・浅井洋光・野須敬弘：「エタノール中DCモータにおける整流過程のアーク発生現象：ブラシ・整流子の接触状態に基づく考察」, 電学論B, Vol. 139, No. 5, pp. 293-301 (2019)
5. (3) K. Sawa, T. Ueki, and K. Miyachi: “On the Initiation of Showering Arc”, IEEJ Trans. Fund. Mater., Vol. 94, No. 8, pp. 325-332 (1974) (in Japanese)