<prompt> Pedzisa mutsara unotevera: Gustaaf Guus Bierings akaberekwa musi wa 28 Gunyana 1956 mutambi wechiDutch akasiya basa uyo aive achishanda pakati pa1975 na1981. Akanga ari mumwe wemapoka echiDutch akakunda mu  <response>: 1978 UCI Road World Championships uye vakapedza vari 15th nzvimbo pa 1980 Summer yeOlympic mu chikwata nguva muedzo. Akakundawo chikamu chimwe cheOlympias Tour muna 1977. 