Alteration of the substrate specificity of Aspergillus oryzae beta-galactosidase by modification with polyethylene glycol Naoi, M.; Kiuchi, K.; Sato, T.; Morita, M.; Tosa, T.; Chibata, I.; Yagi, K. Journal of Applied Biochemistry 6(1-2): 91-102 1984 https://eurekamag.com/research/042/217/042217216.php