Doikov, D., S. Andrievsky, and A. Yushchenko. “Positron Annihilation Spectroscopy of Clumpy Structures 1. Type II Young Supernova Remnants”. Physical Sciences and Technology, vol. 5, no. 1-2, Aug. 2018, pp. 60-69, doi:10.26577/phst-2018-2-147.