| Language | Method | References |
|---|---|---|
| Bulgarian | ISO 9 |
Comparison of different methods
Official method adopted by Bulgarian government A pdf-file with several methods |
| Chinese | ISO 7098 (Hanyu Pinyin) |
Overview of different methods
|
| Greek | ISO 843 |
Overview of different methods
|
| Russian | ISO 9 |
Comparison of different methods
|