Ioannidou, E., Leppänen, A.-P., Melas, D. and Ioannidou, A. 2019. Time lag between the tropopause height and the levels of 7Be concentrations in surface air. HNPS Advances in Nuclear Physics. 24, (Apr. 2019), 102–107. DOI:https://doi.org/10.12681/hnps.1851.