Multiple seimcha: multiple semantic image captcha. Mehrnejad, M., Bafghi, A. G., Harati, A., & Toreini, E. In International Conference for Internet Technology and Secured Transactions, pages 196–201, 2011. IEEE.
bibtex   
@inproceedings{mehrnejad_multiple_2011,
	title = {Multiple seimcha: multiple semantic image captcha},
	copyright = {All rights reserved},
	booktitle = {International {Conference} for {Internet} {Technology} and {Secured} {Transactions}},
	publisher = {IEEE},
	author = {Mehrnejad, Maryam and Bafghi, Abbas Ghaemi and Harati, Ahad and Toreini, Ehsan},
	year = {2011},
	pages = {196--201},
}

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