Verschuren, W. “The Giants of the Dulcian Family: An Exploration of the <em>Doppel Fagott</em> and <em>Fagotcontra</em> In the Writings of Michael Praetorius”. De Musica Disserenda, vol. 15, no. 1-2, Oct. 2019, pp. 125-36, doi:10.3986/dmd15.1-2.06.