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We review application of point-contact Andreev-reflection spectroscopy tostudy elemental superconductors, where theoretical conditions for the smallnessof the point-contact size with respect to the characteristic lengths in thesuperconductor can be satisfied. We discuss existing theoretical models andidentify new issues that have to be solved, especially when applying thismethod to investigate more complex superconductors. We will also demonstratethat some aspects of point-contact Andreev-reflection spectroscopy still needto be addressed even when investigating ordinary metals.

Anatomy of point-contact Andreev reflection spectroscopy from the experimental point of view (review)