Safety functional requirements for ?Robot Fleets forHighly effective Agriculture and Forestry Management? - Pilar Barreiro Elorza; Miguel Garrido Izard; Adolfo Moya González; Benoit Debilde; Patrick Balmer; Jacob Carballido del Rey; Constantino Valero Ubierna; Nicola Tomatis; Bart Missotten (Robotics And Associated High-Technologies And Equipment For Agriculture, 2011)