A. I. Erenburg, N. Ya. Fogel, Yu. V. Bomze, A. Yu. Sipatov, A. I. Fedorenko, V. Langer, and M. Norell, Structural investigations of superconducting multilayers consisting of semiconducting materials, Low Temp. Phys. 27, (2001) [Fiz. Nizk. Temp. 27, 127-130, (2001)] DOI: https://doi.org/10.1063/1.1353698.