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https://www.sciencedirect.com/science/article/pii/S0140673687925426/pdfft?md5=2eabeae7aa27c77ccf2f448855bafebb&pid=1-s2.0-S0140673687925426-main.pdf (beliebiger Volltext)
https://doi.org/10.1016/s0140-6736(87)92542-6 (beliebiger Volltext)
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