@article {1648, title = {Unsupervised Retinal Vessel Segmentation Using Combined Filters}, journal = {Plos One}, volume = {11}, number = {2}, year = {2016}, pages = {1-21}, doi = {10.1371/journal.pone.0149943}, author = {Wendeson S. Oliveira and Joyce Vitor Teixeira and Ing Ren Tsang and George D C Cavalcanti and Jan Sijbers} }