Our work is derivative of that of the BraVa database that requires you to reference it in two ways:

http://cng.gmu.edu/brava

Susan N. Wright, Peter Kochunov, Fernando Mut Maurizio Bergamino, Kerry M. Brown, John C. Mazziotta, Arthur W. Toga, Juan R. Cebral, Giorgio A. Ascoli. Digital reconstruction and morphometric analysis of human brain arterial vasculature from magnetic resonance angiography. NeuroImage, 82, 170-181, (2013). http://dx.doi.org/10.1016/j.neuroimage.2...

It would be swell if you could attribute our project as well: nitrc.org/projects/bravissima