Students of Dhegiha phonology, or of Siouan phonology generally, may be interested in: Starks, Donna; Ballard, Elaine. 2005. Woods Cree /<edh>/: An Unusual Type of Sonorant. IJAL 71.1 (January 2005): 102-115. John E. Koontz http://spot.colorado.edu/~koontz