Vladimir Orel is one of the main modern international linguists to have dealt with the passage from Proto-Indo-European to Proto-Albanian to Modern Albanian. According to Orel, the study of Proto-Albanian syntax remains in its infancy so there are some limitations to the work. However, there have been developments in the understanding of the historical development of phonetics and vocabulary.
^Hamp, Eric (1980) It [i.e. the Albanian language] can be said to be related more closely to Baltic and Slavic than to anything else, and certainly not to be close to Thracian see http://www.lituanus.org/1993_2/93_2_05.htm