1981, Curtis McFarland,A linguistic atlas of the Philippines, page 9:
If on the other hand there are speech varieties in the group which are not mutually intelligible with some other members ― like A and C in the example above ― then the group is defined as anL-complex.
!Xun can be described as anL-complex, that is, as a cluster of speech forms that are linked by a chain of mutual intelligibility, but speakers at the extreme ends of the chain do not understand one another.
