The --39-LINK--39- part is ambiguous — possibly a placeholder or formatting artifact.
If you want a on Dafstb Heft 240 , here's a general template based on typical DAfStb content: Write-up: DAfStb Heft 240 Title (probable): "Zur Frage der Spannungsverteilung und Rissbildung in Stahlbetonbauteilen unter kurzzeitiger Belastung" (or similar – actual title depends on the year; Heft 240 was published around the late 1970s/early 1980s). Dafstb Heft 240 --39-LINK--39-
It looks like you're referencing a specific publication: (likely from the Deutscher Ausschuss für Stahlbeton – German Committee for Reinforced Concrete). The --39-LINK--39- part is ambiguous — possibly a
Reinforced concrete mechanics — stress distribution, cracking behavior under short-term loading. cracking behavior under short-term loading.