Celebratio Mathematica

Wolfgang Haken

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Works connected to Olli Lehto

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W. Haken: “Com­bin­at­or­i­al as­pects of some math­em­at­ic­al prob­lems,” pp. 953–​961 in Pro­ceed­ings of the In­ter­na­tion­al Con­gress of Math­em­aticians (Hel­sinki, 15–23 Au­gust 1978), vol. 2. Edi­ted by O. Le­hto. Uni­versity of Hel­sinki, 1980. MR 562712 Zbl 0424.​05030 incollection