\input zb-basic \input zb-ioport \iteman{io-port 04029246} \itemau{Ahlswede, Rudolf; Wegener, Ingo} \itemti{Search problems. (Zadachi poiska). Transl. from the German.} \itemso{Moskva: Mir. 367 p. R. 1.70 (1982).} \itemab For a review of the German original (1979) see Zbl 0425.90022. \itemrv{~} \itemcc{} \itemut{binary search tree; classification; error-free test; stochastic approximation; identification; rank ordering; stopping rules} \itemli{} \end