Zídek, Z., Tučková, L., Mára, M., Barot-Ciorbaru, R., Prokešová, L., Tlaskalová-Hogenová, H. 1998. Stimulation of macrophages by Bacillus firmus: production of nitric oxide and cytokines. Int. J. Immunopharmacol. 20 : 359-368.