P. van Hees, G. Puchinger, Briefwisseling Gerretson-Van Eyck. BMGN-LCHR [Internet]. 1985 Jan. 1 [cited 2024 Nov. 16];100(3):497-9. Available from: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102872