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https://www.ica.org/standards/RiC/ontology#descriptiveNote
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"From approximately 1932 Sybren Valkema takes drawing lessons from G.J. van Koppenhagen, "a drawing teacher who prepares him for the exam 'LO-acte Handtekenen'" and later for the 'NA-acte Handenarbeid'. Source: 'Sybren Valkema', 1994. p. 61. Klaas Laansma was the editor of the book, Sybren is the source, his notes and continous corrections are included in the archive"
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