following Jacob Grimm, Über Diphtongen (1845)[1]; see also e.g. Joseph Bosworth, A dictionary of the Anglo-Saxon language (1838), s.v. "Sigel"
doi.org
Simms, Douglas P. A. (March 2017). "The Old English Name of the S-Rune and 'Sun' in Germanic". Journal of Germanic Linguistics. 29 (1): 26–49. doi:10.1017/S1470542716000192. S2CID172081569.
Oppedisano, Federico O. (2020). "Visual Aspects of the Symbols of Terrorism. Identity, Representations, and Visual Statues". Proceedings of the 2nd International and Interdisciplinary Conference on Image and Imagination. Advances in Intelligent Systems and Computing. Vol. 1140. pp. 576–588. doi:10.1007/978-3-030-41018-6_47. ISBN978-3-030-41017-9. S2CID216236635.
Simms, Douglas P. A. (March 2017). "The Old English Name of the S-Rune and 'Sun' in Germanic". Journal of Germanic Linguistics. 29 (1): 26–49. doi:10.1017/S1470542716000192. S2CID172081569.
Oppedisano, Federico O. (2020). "Visual Aspects of the Symbols of Terrorism. Identity, Representations, and Visual Statues". Proceedings of the 2nd International and Interdisciplinary Conference on Image and Imagination. Advances in Intelligent Systems and Computing. Vol. 1140. pp. 576–588. doi:10.1007/978-3-030-41018-6_47. ISBN978-3-030-41017-9. S2CID216236635.