1. T. Asai, “Acetic acid bacteria,” University of Tokyo Press, Tokyo, 1968, pp. 5–101.
2. R. T. Ambron and R. A. Pieringer, “Form and Function of Phospholipids,” ed. by G. B. Ansell, J. N. Hawthorne and R. M. C. Dawson, Elsevier Scientific Publishing Co., Amsterdam, 1973, p.289.