Geodesic
Two Theorems on Defect-Freeness for Cyclic Extensions
Matematičeskie trudy, Tome 10 (2007) no. 2, pp. 92-111

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The article contains the proofs of two theorems. Under quite special assumptions, we prove that the $p$-cyclic extensions of Henselian valued fields are defect-free. However, the well-known results by Epp and Kuhlmann are easy consequences of these theorems. 
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Yu. L. Ershov. Two Theorems on Defect-Freeness for Cyclic Extensions. Matematičeskie trudy, Tome 10 (2007) no. 2, pp. 92-111. http://geodesic.mathdoc.fr/item/MT_2007_10_2_a3/