HERMANTO, D.; MUDASIR, M.; SISWANTA, D.; KUSWANDI, B.; ISMILLAYLI, N. Polyelectrolyte Complex (PEC) of the Alginate-Chitosan Membrane for Immobilizing Urease. Journal of Mathematical and Fundamental Sciences, v. 51, n. 3, p. 309-319, 20 Dec. 2019.