 Complete the following phrase:  Gustav Schmidt 9 August 1926  29 December 2016 was a West German sprint canoeist, born in Duisburg, who competed in the 1950s. He won three medals at the ICF Canoe Sprint World Championships with two golds K-4 1000 m and K-4 10000 m: both 1958 and a silver K-2 1000 m: 