Putra, Heriansyah, and Irgie Yudhistira. “Improvement of the California Bearing Ratio of Peat Soil Using Soybean Crude Urease Calcite Precipitation”. Civil Engineering Journal, vol. 8, no. 11, Nov. 2022, pp. 2411-23, doi:10.28991/CEJ-2022-08-11-04.