@article {smyrnis2014two,
	title = {Two independent sources of anisotropy in the visual representation of direction in 2-D space},
	journal = {Experimental brain research},
	volume = {232},
	number = {7},
	year = {2014},
	pages = {2317{\textendash}2324},
	publisher = {Springer Berlin Heidelberg},
	author = {Smyrnis, Nikolaos and Mantas, Asimakis and Evdokimidis, Ioannis}
}
