​according to Bicester and Willemyns 1989 discuss conceptualizations of and around the notion of the "language continuum".

Bicester and Willemyns (1989) discuss the concept of the "language continuum" in the context of language variation and change. They argue that languages cannot be neatly categorized into distinct categories, such as dialects or languages, but instead exist along a continuum of linguistic variation. This continuum is characterized by a range of linguistic features, including vocabulary, grammar, and pronunciation, that vary across different speech communities.

The authors also highlight the importance of considering the historical, social, and political factors that contribute to the formation of language continua. They argue that language variation is often shaped by complex interactions between different linguistic groups, as well as by colonization, migration, and other forms of contact between speakers of different languages.

Bicester and Willemyns (1989) suggest that the notion of a language continuum challenges traditional perspectives on language classification and standardization, which tend to prioritize certain varieties of a language over others. They propose that a more nuanced understanding of language variation can help to promote linguistic diversity and facilitate communication between different speech communities.

Overall, Bicester and Willemyns (1989) offer a critical analysis of the concept of the language continuum and suggest that it is a useful framework for understanding the complex nature of language variation and change.