RECOMMENDATION ITU-R BT.1124-3 - Reference signals for ghost cancelling in analogue television systems
ANNEX 1 - GCR signal specifications for conventional TV systems
1 Introduction
    1.1 GCR Signal A
    1.2 GCR signal B
    1.3 GCR signal C
APPENDIX 1 TO ANNEX 1 - Possible alternative formulae for mathematical definition of GCR signal ?
ANNEX 2 - GCR specifications for advanced TV systems