Int. j. hydrogen energy Int. j. hydrogen energy European hydrogen train the trainer framework for responders: Outcomes of the HyResponder project Brennan Síle Brauner Christian Davis Dennis De Backer Natalie Dyck Alexander García-Hernández César Universidad de Zaragoza Vagner Gaathaug André Kupka Petr Grand-Clement Laurence Havret Etienne Houssin Deborah Lecomte Laurent Maranne Eric Steele Pippa Russo Paola Pinilla Adolfo Schoepf Gerhard Molkov Vladimir 2024 research-article