"Sleep disorders in patients with severe mental depression: double-blind placebo-controlled evaluation of the value of pipamperone (Dipiperon)". Acta Psychiatrica Scandinavica. 55 (2): 116-22. Şubat 1977. doi:10.1111/j.1600-0447.1977.tb00147.x. PMID320830.
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"Sleep disorders in patients with severe mental depression: double-blind placebo-controlled evaluation of the value of pipamperone (Dipiperon)". Acta Psychiatrica Scandinavica. 55 (2): 116-22. Şubat 1977. doi:10.1111/j.1600-0447.1977.tb00147.x. PMID320830.