YDE I/51 – II/96 – VI/75, 77 – VII/81 – XI/80, 83 – XXXIII/100 – XXXV/94
YNGELS VIII/67 – XXXIII/87
YNGHELBRECHT XXXV/94
YNGHELS VIII/61, 62, 65
YSERMAN X/60 – XXXIII/97, 98
YSSERMAN III/59, 69, 74 – VI/47
YZENBERG IV/109