Kyratzis, D., and I. Savvidis. “Study and Detection of Relativistic Solar Neutrons at Ground Level With the Spherical Proportional Counter”. HNPS Advances in Nuclear Physics 26 (April 1, 2019): 75–82. Accessed May 4, 2024. https://eproceedings.epublishing.ekt.gr/index.php/hnps/article/view/1801.