MathSciNet bibliographic data MR495193 (58 #13924) 68A20 Fredman, Michael L.; Weide, Bruce On the complexity of computing the measure of \$\bigcup {}[a\sb{i},\ b\sb{i}]\$$\bigcup {}[a\sb{i},\ b\sb{i}]$. Comm. ACM 21 (1978), no. 7, 540–544. Article

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