Ognjen Stanojev Lesia Mitridati Riccardo de Nardis di Prata Gabriela Hug Safe Reinforcement Learning for Strategic Bidding of Virtual Power Plants in Day-Ahead Markets. 1-7 2023 SmartGridComm https://doi.org/10.1109/SmartGridComm57358.2023.10333971 conf/smartgridcomm/2023 db/conf/smartgridcomm/smartgridcomm2023.html#StanojevMPH23