 Complete the following phrase:  Meanwhile, in 1957, Kilius began skating with Hans-Jürgen Bäumler under the tutelage of Erich Zeller. Between 1958 and 1964, they won the German Championships four times, European Championships six times and the World Championships two times. Their first World title, in 1963, followed cancellation of the 1961 event due to the crash of Sabena Flight 548 and a collision during their performance at the 