A survey of open source processors for FPGAs. Jia, R., Lin, C. Y., Guo, Z., Chen, R., Wang, F., Gao, T., & Yang, H. In Field Programmable Logic and Applications (FPL), 2014 24th International Conference on, pages 1–6, 2014.
doi  bibtex   
@inproceedings{jia_survey_2014,
	title = {A survey of open source processors for {FPGAs}},
	doi = {10.1109/FPL.2014.6927482},
	booktitle = {Field {Programmable} {Logic} and {Applications} ({FPL}), 2014 24th {International} {Conference} on},
	author = {Jia, Rui and Lin, C. Y. and Guo, Zhenhong and Chen, Rui and Wang, Fei and Gao, Tongqiang and Yang, Haigang},
	year = {2014},
	pages = {1--6},
}

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