“Formulation and Viability of Consortia LIBeM Using Protective Agent Skim Milk Subjected to Freeze Drying Method for Degradation of Oil Sludge Contaminated Soil”, J Environ Microbiol Toxicol, vol. 7, no. 2, pp. 14–19, Dec. 2019, doi: 10.54987/jemat.v7i2.491.