00311nam a2200121Ia 4500008004100000082001500041100001700056245004000073260004400113300000800157942000700165999001700172190709s9999 xx 000 0 und d a793.74 B17 aBakst, Aaron 0aMathematical puzzles and past times aPrincetonbD Van Nostrand Companyc1954 a206 cBK c41101d41101