Some articles on dagestanian:
Northeast Caucasian Languages - Language Classification
... A long-time classification divided the family into Nakh and Dagestanian branches, whence the term Nakho-Dagestanian ... the protolanguage suggest that the Nakh languages are no more divergent from Dagestanian than the various branches of Dagestanian are from each other, although this is still ...
... A long-time classification divided the family into Nakh and Dagestanian branches, whence the term Nakho-Dagestanian ... the protolanguage suggest that the Nakh languages are no more divergent from Dagestanian than the various branches of Dagestanian are from each other, although this is still ...