DIN VDE V 0831-103:2013 Electric signalling systems for railways - Part 103: Identification of safety requirements for technical functions in railway signalling
2014DIN VDE V 0831-103:2014 Electric signalling systems for railways - Part 103: Identification of safety requirements for technical functions in railway signalling
2013DIN VDE V 0831-103:2013 Electric signalling systems for railways - Part 103: Identification of safety requirements for technical functions in railway signalling