Estimation of Brainstem Neuronal Loss in ALS with in Vivo Proton Magnetic Resonance SpectroscopyNeurol 50:72-77, Cwik,V.A.,et al, 1998
Paraneoplastic Syndromes Affecting Brain and Cranial NervesUpToDate May 2009, Dalmau,J. &Rosenfeld,M., 2009