"Anatolian Evidence Suggests that the Indo-European Laryngeals *h2 and *h3 Were Uvular Stops". Indo-European Linguistics (англ.). 6 (1): 69—94. doi:10.1163/22125892-00601003
Martin Kümmel, department of Indo-European linguistics, University of Jena. Uvular Stops or a Glottal Fricative? Theory and Data in Recent Reconstructions