Danish Sign Language [dani1246], Icelandic Sign Language [icel1236] and Norwegian Sign Language [norw1255] are lexically and historically related ( Kristín Lena Thorvaldsdóttir and Elísa Gudrún Brynjólfsdóttir 2016 , Odd-Inge Schröder 1993 ). Historical and some meagre lexical evidence suggests that Madagascar Sign Language [mada1271] derives from a Norwegian Sign Language introduced in the 1960s ( Minoura, Nobukatsu 2014 ). The Danish-Icelandic subgroup can be established on lexical comparison (63%, Aldersson, Russell R. and Lisa J. McEntee-Atalianis 2007 ) and historical evidence ( Kristín Lena Thorvaldsdóttir and Elísa Gudrún Brynjólfsdóttir 2016 ):812.
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Glottolog