Daghero, D., Tortello, M., Pecchio, P., Stepanov, V., & Gonnelli, R. (2013). Point-contact Andreev-reflection spectroscopy in anisotropic superconductors: the importance of directionality (Review Article). ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, 39(3), 261–285. https://doi.org/10.1063/1.4794994