Janpen Tangjitjaroenkun; Vichien Kitpreechavanich; Surang Suthirawut; Pratumporn Chim-anage; Wanna Praprilong; Warawut Krusong; Busaba Yongsmith. Improvement of High Vitamin B12 Thua nao by Mixed Cultures of Soybean Oligosaccharide and the Use of Bacteria and Yeasts. Agr. Nat. Resour. 2004, 38, 123-130.