References
- Aström K-E, Mancall EL, Richardson EP, Jr. Progressive multifocal leukoencephalopathy. Brain 1958; 81: 93–111
- Richardson EP, Jr. Progressive multifocal leukoencephalopathy. NEJM 1961; 265: 815–823
- Richardson EP, Jr. Progressive multifocal leukoencephalopathy personal experiences. Bernard J. Alpers Lecture. Philadelphia 1994