1. Agency of Ind.Sci.Techn. (1982): Jpn.Kokai 82,130,914, (C.A. 97:222952)
2. Ajinomoto Co. (1982): Jpn.Kokai 82,1 9 1,787, (C.A. 98:124208)
3. Akito E., Watanabe H. (Nippon Kayaku Co.) (1975): Jpn.Kokai 75,35,315, (C.A. 83: 33071)
4. Akito E., Nakajima Y., Horioka M. (Teijin Ltd) (1978): US Pat. 4,073,931,: Jpn.Kokai 75,129,520,(C.A. 84:58617)
5. Akiyama Y., (Akiyama K.K.) (1977): Jpn.Kokai 77,114,014, (C.A. 88:27824)