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On the Triggering Mechanisms of Upward Lightning.
Schumann C, Saba MMF, Warner TA, Ferro MAS, Helsdon JH Jr, Thomas R, Orville RE. Schumann C, et al. Sci Rep. 2019 Jul 3;9(1):9576. doi: 10.1038/s41598-019-46122-x. Sci Rep. 2019. PMID: 31270371 Free PMC article.
Optical observation of needles in upward lightning flashes.
Saba MMF, de Paiva AR, Concollato LC, Warner TA, Schumann C. Saba MMF, et al. Among authors: schumann c. Sci Rep. 2020 Oct 15;10(1):17460. doi: 10.1038/s41598-020-74597-6. Sci Rep. 2020. PMID: 33060750 Free PMC article.