The Importance of Research. Allbutt TC. Hospital (Lond 1886). 1900 Oct 06;29(732):11-12. PMID: 29813577
[Heinrich Düker: in memory of the pioneer and preserver]. Tent L. Arch Psychol (Frankf). 1988;140(3):143-8. PMID: 3071298
[Heinrich Pette Nov. 23, 1887-Oct. 2, 1964]. Zülch KJ. Verh Dtsch Ges Pathol. 1965;49:394-7. PMID: 4160588