@book { BuildingUpAspect,
    title = "Building Up Aspect",
    subtitle = "A study of aspect and related categories in Bulgarian, with parallels in English and French",
    author = "Maria {Stambolieva}",
    year = "2008",
    publisher = "Peter Lang Verlag",
    address = "Oxford, United Kingdom",
    url = "https://www.peterlang.com/document/1104161"
}