@conference {asad2013improved,
	title = {An improved ant colony system for retinal blood vessel segmentation},
	booktitle = {Computer Science and Information Systems (FedCSIS), 2013 Federated Conference on},
	year = {2013},
	note = {n/a},
	pages = {199{\textendash}205},
	publisher = {IEEE},
	organization = {IEEE},
	abstract = {n/a},
	author = {Ahmed Hamza Asad and Ahmad Taher Azar and Mohamed Mostafa M. Fouad and Aboul Ella Hassanien}
}
