Interview with Viktor Kassai here:
https://www.digisport.hu/51131/a-tekintelyt-nem-a-lapokkal-kell-megszerezniIt's in Hungarian though.
Did like this from him: " Authority doesn't have to be gained with cards. A referee who tries to gain authority with cards is on the wrong track. Authority is a human trait that you can earn with your personality, and therefore the referee must be determined to have authority on the field. even without cards ."