Hans Ferdinand Massmann, "über handschriftliche Fechtbücher", Serapeum: Zeitschrift für Bibliothekwissenschaft, Handschriftenkunde, und ältere Litteratur, ed. Robert Naumann, 1844, p. 54.
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"the GMN 3227a [contains] text passages and recipes [of the kind] that became common 10-20 years later than 1389. Looking at the content in comparison to other manuscripts a dating to 1410-1420 is more likely but this pure speculative." Jens P. Kleinau, 1418 Modus Dimicandi Magistri H. Beringois of the Ms. G.B.f.18.a (2013)
