Graham KC, Spiegel DR (2008). "Pseudobulbar palsy and affect in a case of progressive multifocal leukoencephalopathy". The Journal of Neuropsychiatry and Clinical Neurosciences. 20 (1): 110–111. doi:10.1176/jnp.2008.20.1.110. PMID18305298.
Graham KC, Spiegel DR (2008). "Pseudobulbar palsy and affect in a case of progressive multifocal leukoencephalopathy". The Journal of Neuropsychiatry and Clinical Neurosciences. 20 (1): 110–111. doi:10.1176/jnp.2008.20.1.110. PMID18305298.