%0 Book Section %T The computational problems of using OWA operators publisher World Scientific %D 1995 %U 978-981-02-2345-8 %@ https://hdl.handle.net/20.500.14352/60891 %X In this paper we will analyze some computational problems related with the use of OWA operators as information aggregators. In particular we will concentrate on ordered hierarchical aggregations of OWA operators as defined in [4]. %~