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The article reads like there could be some Dutch or West Frisian POV. Hints: "Netherlands", "Dutch province", "Gysbert Japix ... father of modern West Frisian", "grammatical feature in almost all West Frisian dialects [...] Therefore, the Modern Frisian period is considered to have begun at this point in time, around 1820".
Sources contradicting this article:
Roland Harweg, Studien zum Verbum und seinem Umfeld Aufsätze, 2014, p. 408: "... vom Altfriesischen (eine mittelfriesische Sprachstufe pflegt man nicht anzusetzen) zum Neufriesischen ...". That is: It's uncommon to have a Middle Frisian period.
Damaris Nübling, Prinzipien der Irregularisierun, 2000, p. 33: "Eine mittelfriesische Periode wird entsprechend erst von 1550-1800 angesetzt (Tiersma 1985: 4)." That is: The Middle Frisian period ranges from 1550 till 1800 (and not 1820). A reason for using 1800 could be: dialect literature (German: Mundartliteratur, also Dialektliteratur) arises in Germany around 1800 (e.g. Johann Peter Hebel), and so does the rare Frisian literature in Germany (e.g. "Der Geitzhals auf der Insel Silt" from 1809). Between 1600 and 1800 there isn't much Frisian from Germany (for example, for Wursten Frisian only a short word list was published during that time).
