GOFLEX: extracting, aggregating and trading flexibility based on FlexOffers for 500+ prosumers in 3 European cities [operational systems paper]. - Bijay Neupane; Laurynas Siksnys; Torben Bach Pedersen; Rikke Hagensby Jensen; Muhammad Aftab; Bradley Eck; Francesco Fusco; Robert Gormally; Mark Purcell; Seshu Tirupathi; Gregor Cerne; Saso Brus; et al. (e-Energy, 2022)