article by Helmut Heissenbüttel published in Merkur (2014), issue 786, pp. 1033-1039.
book by Helmut Heißenbüttel, published in Stuttgart, Klett-Cotta, 1986
article by Helmut Heißenbüttel published in Merkur (2007), no. 697, pp. 414-420.
book edition published in 1970
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