ハンス＝ヨアヒム・ヤープス
1 2 Williamson 1989, p. 122.
↑ Obermaier 1989, p. 62.
1 2 Thomas 1997, p. 318.
↑ Patzwall and Scherzer 2001, p. 205.
1 2 Scherzer 2007, p. 415.