Sen, N. R. On radiation in an expanding universe. (English) Zbl 0005.09102 Indian Phys.-Math. J. 3, 89-95 (1932). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:relativity theory PDFBibTeX XMLCite \textit{N. R. Sen}, Indian Phys.-Math. J. 3, 89--95 (1932; Zbl 0005.09102)