1. Diabetic retinopathy: what you should know, National Eye Institute, National Institute of Health, 2003, NIH Publication No. 03-2171.
2. A. Salazar-Gonzalez, D. Kaba, Y. Li, and X. Liu, Segmentation of blood vessels and optic disc in retinal images, IEEE J. Biomed. Health Inform. (2014).
3. M. Niemeijer, J. Staal, B. Ginneken, M. Loog, M. Abramoff, DRIVE: Digital Retinal Images For Vessel Extraction, 〈http://www.isi.uu.nl/Research/Databases/DRIVE 〉, 2004.
4. Locating blood vessels in retinal images by piece-wise threshold probing of a matched filter response;Hoover;IEEE Trans. Med. Imaging,2000
5. V. Kalesnykiene, J.K. Kamarainen, R. Voutilainen, J. Pietilä, H. Kälviäinen, H. Uusitalo, Diaretdb1 diabetic retinopathy database and evaluation protocol, 2007 〈http://www.it.lut.fi/project/imageret/diaretdb1〉.