● Yanokura E,Oki K,Makino H,Modesto M,Pot B,Mattarelli P,Biavati B,Watanabe K (2015). Subspeciation of Bifidobacterium longum by multilocus approaches and amplified fragment length polymorphism: Description of B. longum subsp. suillum subsp. nov., isolated from the faeces of piglets. Syst. Appl. Microbiol.38, 305-14.