Jovanovic-Malinovska, R.; Amartey, S. A.; Kuzmanova, S.; Winkelhausen, E.; Cvetkovska, M.; Tsvetanov, C. The Use of poly(ethylene Oxide) Hydrogels As Immobilization Matrices for Yeast Cells. Maced. J. Chem. Chem. Eng. 2006, 25, 113-119.