@article{no-author:1990,
  title = {CHANGES IN THE SOVIET UNION AND EASTERN EUROPE: SOURCES AND NATURE},
  journal = {BIISS Journal},
  year = {1990},
  pages = {1-26},
  url = {https://biiss.trustitbdltd.com/storage/uploads/pdfs/5202849889b4aa3ad6358281e5214e49.pdf},
}