Heitler, W.; Powell, C. F.; Fertel, G. E. F. Heavy cosmic ray particles at Jungfraujoch and sea-level. (English) Zbl 0022.19201 Nature, London 144, 283-284 (1939). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:Relativistic quantum theory PDF BibTeX XML Cite \textit{W. Heitler} et al., Nature, London 144, 283--284 (1939; Zbl 0022.19201) Full Text: DOI OpenURL