Watchariya Purivirojkul, Monchan Maketon and Nontawith Areechon 2005. Probiotic Properties of Bacillus pumilus, Bacillus sphaericus and Bacillus subtilis in Black Tiger Shrimp (Penaeus monodon Fabricius) Culture. Agriculture and Natural Resources. 39, 2 (Jun. 2005), 262–273.