RU 2475542 C1. Ivshina I.B., Kuyukina M.S., Krivoruchko A.V., Naimark O.B., Plekhov O.A., Fedorova A.Y. Method and plant to determine efficiency of adsorption immobilisation of microorganisms and monitoring of functional condition of biocatalysts based on immobilised microbial cells. Application: 2011154123/10, 29.12.2011. Effective date for property rights: 29.12.2011. Date of filing: 29.12.2011. Date of publication: 20.02.2013. Bull. 5.