RT Journal Article T1 A switching multi-level method for the long tail recommendation problem A1 Alshammari, Gharbi A1 Jorro Aragoneses, José Luis A1 Polatidis, Nikolaos A1 Kepatenakis, Stelios A1 Pimenidis, Elias A1 Petridis, Miltos PB IOS Press YR 2019 FD 2019-12-23 LK https://hdl.handle.net/20.500.14352/108125 UL https://hdl.handle.net/20.500.14352/108125 LA eng DS Docta Complutense RD 10 abr 2025