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[[Charlie]] - [[Bs6676|Bs'66'76]] <ref>[[Jaap van den Herik]] ('''1985'''). ''[https://research.tilburguniversity.edu/en/publications/problemen-rondom-lombaers-2 Problemen rondom Lombaers]''. Operations research: Practice and theory: Symposium on the occasion of the farewell of [[Mathematician#HLombaers|H.J.M. Lombaers]], June 06, 1985, [[Delft University of Technology|TU Delft]], [https://pure.uvt.nl/ws/portalfiles/portal/1242228/PROBLEM_.PDF pdf](Dutch)</ref>