Seasonal variability of the soil ${CO_{2}}$ flux and its isotopic composition in southern Poland / Zbigniew GORCZYCA, Kazimierz RÓŻAŃSKI, Tadeusz KUC, Barbara MICHALEC // Nukleonika : the International Journal of Nuclear Research / Institute of Nuclear Chemistry and Technology, Polish Nuclear Society, National Atomic Energy Agency ; ISSN 0029-5922. — 2003 vol. 48 nr 4, s. 187–196. — Bibliogr. s. 195–196, Abstr.