Khader M. Hasan and Ponnada A. Narayana.
Computation of the Fractional Anisotropy and Mean Diffusivity
Maps Without Tensor Decoding and Diagonalization: Theoretical Analysis and
Validation.
Magnetic Resonance in Medicine, 50:589-598, 2003.
(pdf)
(bibtex:
Khader-2003-CFA).