ZILDA, D. S. (2013) “Optimization of Culture Conditions to Produce Thermostable Keratinolytic Protease of Brevibacillus thermoruber LII, Isolated from the Padang Cermin Hot Spring, Lampung, Indonesia”, Microbiology Indonesia, 6(4), p. 8. doi: 10.5454/mi.6.4.8.