Vigesimal system

Hi,
Little has been published on the vigesimal system of counting which is
used in French, Basque, Danish, Icelandic, Caucasian, Sumerian, and
residually in Spain, Portugal, Albania, English (score, fourscore...)
and some Slavic dialects (i.e. the Resian dialect of Slovenian). Could
anybody direct me to some such publications ?
Thanks
Michel