Rampungake ukara ing ngisor iki: Constantin uga menang wolung medali ing ICF Canoe Sprint World Championships kanthi perak (K-2 500 m: 1977) lan pitung perunggu (K-2 500 m:
1978, 1979, 1981; K-4 500 m: 1974, 1978, 1979, 1983).