IACR paper details
@inproceedings{asiacrypt-2009-18560,
title={Preimages for Step-Reduced SHA-2},
booktitle={Advances in Cryptology - ASIACRYPT 2009, 15th International Conference on the Theory and Application of Cryptology and Information Security, Tokyo, Japan, December 6-10, 2009. Proceedings},
series={Lecture Notes in Computer Science},
publisher={Springer},
volume={5912},
pages={578-597},
doi={10.1007/978-3-642-10366-7_34},
author={Kazumaro Aoki and Jian Guo and Krystian Matusiewicz and Yu Sasaki and Lei Wang},
year=2009
}
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