Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...
Mass Spectrometry Laboratory, Department of Ecotechnologies, IIQAB-CSIC. C/Jordi Girona 18−26, 08034-Barcelona, Spain, and AGBAR. Aigües de Barcelona S.A. Passeig de Sant Joan 45, 08009-Barcelona, ...
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