Celebratio Mathematica

P. Er­dős and M. E. Rud­in: “A non-nor­mal box product,” pp. 629–​631 in In­fin­ite and fi­nite sets: Ded­ic­ated to P. Er­dős on his 60th birth­day (Keszthely, Hun­gary, 1973), vol. 2. Edi­ted by A. Hajn­al, R. Rado, and V. T. Sos. Col­loquia Math­em­at­ica So­ci­e­tatis János Bolyai 10. North-Hol­land (Am­s­ter­dam), 1975. MR 394537 Zbl 0328.​54017 incollection