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- Joaquim Filipe, Michal Smialek, Alexander Brodsky, Slimane Hammoudi, editors, Proceedings of the 23rd International Conference on Enterprise Information Systems, ICEIS 2021, Online Streaming, April 26-28, 2021, Volume 1. SCITEPRESS, 2021.
- Joaquim Filipe, Michal Smialek, Alexander Brodsky, Slimane Hammoudi, editors, Proceedings of the 23rd International Conference on Enterprise Information Systems, ICEIS 2021, Online Streaming, April 26-28, 2021, Volume 2. SCITEPRESS, 2021.