In-memory distributed software solution to improve the performance of recommender systems. - Enrique Costa-Montenegro; Alexander Tsybanev; Héctor Cerezo-Costas; Francisco Javier González-Castaño; Felipe J. Gil-Castiñeira; Ana Belén Barragáns-Martínez; Diego Almuiña-Troncoso (Softw. Pract. Exp., 2017)