Bohumil Vykypěl
Studia Etymologica Cracoviensia, Volume 17, Issue 3, 2012, s. 137 - 139
https://doi.org/10.4467/20843836SE.12.009.0399
A possible Celtic loanword in Slavic
The author discusses the possibility to explain Slavic *voldyka as a Celtic loanword.