Fundamental study on countermeasures against subharmonic vibration of order 1/2 in automatic transmissions for carsFumiya Takino, Takahiro Ryu, Takashi Nakae, Kenichiro Matsuzaki and Risa UenoMATEC Web Conf., 211 (2018) 13004DOI: https://doi.org/10.1051/matecconf/201821113004