Schurer, Frans; van Harn, Klaas In memoriam Fred Steutel (1931–2017). Mathematican columnist, letter writer and sportsman. (Dutch) Zbl 1384.01075 Nieuw Arch. Wiskd. (5) 18, No. 4, 265-271 (2017). MSC: 01A70 PDFBibTeX XMLCite \textit{F. Schurer} and \textit{K. van Harn}, Nieuw Arch. Wiskd. (5) 18, No. 4, 265--271 (2017; Zbl 1384.01075)
Abel, Ulrich; Butzer, Paul L.; Schurer, Frans On life and work of P. C. Sikkema (1919–1998). (Dutch) Zbl 1227.01028 Nieuw Arch. Wiskd. (5) 12, No. 1, 66-72 (2011). MSC: 01A70 PDFBibTeX XMLCite \textit{U. Abel} et al., Nieuw Arch. Wiskd. (5) 12, No. 1, 66--72 (2011; Zbl 1227.01028) Full Text: Link