Safety Performance Functions to predict Separation Minima Infringements in en-route airspace - Raquel Delgado-Aguilera Jurado, Vict or Fernando Gómez Comendador, María Zamarreño Suárez, Francisco Pérez Moreno, Christ ian Eduardo Verdonk Gallego, Rosa M Arnaldo Valdés (Iop Conference Series: Materials Science And Engineering, 2022)