Cadusii in Encyclopædia Iranica by Rudiger Schmitt
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Marcel Bazin- Gilan in Encyclopædia Iranica:Geography and Ethnography
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Its main ethnic groups belong all to the northwestern branch of the Iranian linguistic group (Bazin and Bromberger, pp. 13-14 and map 3). The most important one is the Gīlak, who live in the central plain, the eastern coastal fringe and the southeastern highlands. But both dialectal differences and socio-cultural features oblige to divide the Gīlak into three groups: the raštī and lāhījānī Gīlak, respectively in the western and the eastern part of the plain, show only slight differences, but the gālešī Gīlak or deylamī in the southwestern mountains have quite another language as well as an agropastoral way of life opposed to that of the Gīlak paddy-growers in the plain.