Roger Gillham · Ruggero Golini
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| The genesis of the modern Bulgarian literary language | 978-91-554-2710-8 (91-554-2710-3) | 1991 |
| The monosyllabic nouns in modern standard Bulgarian | 978-91-506-1241-7 (91-506-1241-7) | 1997 |