1. Fraser A: . The Gypsies. Oxford, Blackwell Publishers 1993
2. Hancock I: . The emergence of Romani as a koïné outside of India. Personal communication (preprint).
3. Marushiakova E, Popov V: . Gypsies (Roma) in Bulgaria. Studien zur Tsiganologie and Folkloristik, Band 18. Frankfurt am Main, Peter Lang 1997
4. Mastana SS, Papiha SS: . Origin of Romany Gypsies – genetic evidence. Z Morph Anthrop 1992 79: 43–51.
5. Hammer MF, Horai S: . Y chromosomal DNA variation and the peopling of Japan. Am J Hum Genet 1995 56: 951–962.