Authors: S. Martynova, G. Moroz
Here is an abstract. Download database: .csv
Here is a map of the languages from database:
##
## ʁ q' q χ χʷ χː ʁʷ qʷ' qʷ qː ɢ χʲ q'ː ʁʲ ɢʷ
## 36 33 31 30 13 13 12 12 11 11 8 5 4 3 3
## qʲ' qχ χʷː ʁˤ ʁʷˤ qˤ qˤ' qʷː qʷˤ' qχ' qʲ qʰ qː' qʷˤ qʰʷ
## 3 3 3 2 2 2 2 2 2 2 1 1 1 1 1
## qχʷ χˤ χʷˤ
## 1 1 1