Hughes 2012, p. 166. Hughes, A. J. (2012). "On substantiating Indo-European *wḷHos 'wolf' in Celtic, Continental and Insular". Études celtiques. 38 (1): 165–173. doi:10.3406/ecelt.2012.2352.
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"that people of the Volcae who are called Tectosages" (Strabo, IV.1.12 on-line text).