Spencer, Andrew and Popova, Gergana. 2024. Morphology and Syntax in Competition: The Place of Inflectional Periphrasis. In: Adam Ledgeway; Edith Aldridge; Anne Breitbarth; Katalin Kiss É.; Joseph Salmons and Alexandra Simonenko, eds. The Wiley Blackwell Companion to Diachronic Linguistics. Wiley Blackwell. ISBN 9781119898016 [Book Section] (Forthcoming)

Popova, Gergana and Spencer, Andrew. 2020. Volitional mood in South Slavic with a focus on Bulgarian: a paradigmatic view. Linguistica, 60(1), pp. 61-81. ISSN 0024-3922 [Article]

Popova, Gergana and Spencer, Andrew. 2020. Stacked Periphrases. In: Teodora Radeva-Bork and Peter Kosta, eds. Current development in Slavic linguistics: Twenty years after. Frankfurt: Peter Lang, pp. 217-228. ISBN 9783631676738 [Book Section]

Spencer, Andrew and Popova, Gergana. 2015. Periphrasis and Inflection. In: Matthew Baerman, ed. The Oxford Handbook of Inflection. Oxford: Oxford University Press, pp. 197-232. ISBN 9780199591428 [Book Section]

Popova, Gergana and Spencer, Andrew. 2013. Relatedness in periphrasis. In: Marina Chumakina and Greville G. Corbett, eds. Periphrasis: The Role of Syntax and Morphology in Paradigms. Oxford: Oxford University Press for the British Academy, pp. 191-225. ISBN 9780197265253 [Book Section]

Brown, Dunstan; Chumakina, Marina; Corbett, Greville G.; Popova, Gergana and Spencer, Andrew. 2012. Defining periphrasis: key notions. Morphology, 22(2), pp. 233-275. ISSN 1871-5621 [Article]

Popova, Gergana. 2005. ‘Integrating Nominalisations into a (Generalised) Paradigm Function Model of Morphology’. In: Gergana Popova; Ryo Otoguro and Andrew Spencer, eds. Essex Research Reports in Linguistics 47. Department of Language and Linguistics. University of Essex. [Book Section]

Otoguro, Ryo; Popova, Gergana and Spencer, Andrew, eds. 2005. Proceedings of the York-Essex Morphology Meeting 2, Essex Research Reports in Linguistics. Departmenty of Language and Linguistics, . [Edited Journal]