This special issue of Distributed Computing is based on papers that originally appeared as extended abstracts in the Proceedings of the 38th Symposium on Principles of distributed computing (PODC 2019), held in Toronto, Ontario, Canada. In addition to being reviewed, in preliminary form, by the Program Committee, the full papers submitted for the Special Issue were refereed according to the standard practices of Distributed Computing. We thank the program committee, the handling editors, the referees and the authors of these papers. [Extracted from the article]
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