Please cite the following reference when using TractoR in your
work:
J.D. Clayden, S. Muñoz Maniega, A.J. Storkey, M.D. King, M.E. Bastin & C.A.
Clark (2011). TractoR: Magnetic resonance imaging and tractography with R.
Journal of Statistical Software 44(8):1-18.
https://www.jstatsoft.org/v44/i08/.