See Лексика 1971,215; Гигинейшвили 1977,69; Талибов 1980,301.

    [One must also consider the possibility of relating here Darg. Ak. č̣i 'thread' - if it originally meant 'leather thread or strip'. In this case, however, we would have to change the cluster -ɫɦ- to -lh- to account for the loss of resonant in Darg. Lak. č̣ulū would then have to be analyzed as a suffixed form (otherwise the regular reflex would be č̣u, also with loss of -l) - which is not improbable, in view of the mentioned above discrepancy between the Lak. and PL Auslauts).]