1. K. Iwasawa, “On Galois groups of local fields,” Trans. Amer. Soc., 80, No. 2, 448–469 (1955).
2. K. Iwasawa, “On local cyclotomic fields,” J. Math. Soc., 12, No. 1, 16–21 (1960).
3. M. Krasner, “Sur la representation exponentielle dans les corps relativement galoisiens de nombres p-adiques,” Acta Arithm., 3, No. 1, 133–173 (1939).
4. Z. I. Borevich, “The multiplicative group of a regular local field with a cyclic group of operators,” Izv. Akad. Nauk SSSR Ser. Mat., 28, No. 3, 707–712 (1964).
5. Z. I. Borevich and S. V. Vostokov, “Ring of integers in an extension of prime degree of a local field as the Galois module,” Zap. Nauchn. Semin. LOMI, 31, 24–37 (1973).