@article{Kortlandt2010,
  author    = {Frederik H. H. Kortlandt},
  title     = {Proto-Indo-European verbal syntax},
  journal   = {Journal of indo-european studies},
  volume    = {1983},
  pages     = {307 -- 324},
  url       = {http://www.kortlandt.nl/publications/art049e.pdf},
  year      = {2010},
}