Mechanism for single crystal refinement in high purity niobium during equal-channel angular pressingKommel, Lembit; Laev, NataljaMaterials science2008 / p. 319-323 : ill Mechanism for single crystal refinement in high purity niobium during equal-channel angular pressingKommel, Lembit; Laev, Natalja17th International Baltic Conference : Materials Engineering 2008 : November 6-7, Kaunas, Lithuania : abstracts of papers2008 / p. 12