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Ludin, Sabina; Ludin, Hans-Peter (1989). Is Parkinson's disease of early onset a separate disease entity? Journal of neurology, 236(4), pp. 203-207. Springer-Medizin-Verlag 10.1007/BF00314500
Ludin, Sabina; Steiger, Ursula; Ludin, Hans-Peter (1987). Autonomic disturbances and cardiovascular reflexes in idiopathic Parkinson's disease. Journal of neurology, 235(1), pp. 10-15. Springer-Medizin-Verlag 10.1007/BF00314190
