Taniguchi Yoshiaki, Miki Tsubasa, Yasuhide Ohno, Masao Nagase, Yukihiro Arakawa, Yasushi Imada, Keiji Minagawa and Mikito Yasuzawa, “Suppression of protein adsorption on a graphene surface by phosphorylcholine functionalization”, Japanese Journal of Applied Physics, Vol.58, No.5, pp.055001 (2019).