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In page Joseph Greenberg:

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Greenberg's subgrouping of these languages has not been accepted by the few specialists who have worked on the classification of these languages.[citation needed] However, the work of Stephen Wurm (1982) and Malcolm Ross (2005) has provided considerable evidence for his once-radical idea that these languages form a single genetic unit. Wurm stated that the lexical similarities between Great Andamanese and the West Papuan and Timor–Alor families "are quite striking and amount to virtual formal identity [...] in a number of instances." He believes this to be due to a linguistic substratum.