Geodesic
An example of a torsion-free nilpotent group having no outer automorphisms
Matematičeskie zametki, Tome 11 (1972) no. 1, pp. 21-26 
A. E. Zalesskii. An example of a torsion-free nilpotent group having no outer automorphisms. Matematičeskie zametki, Tome 11 (1972) no. 1, pp. 21-26. http://geodesic.mathdoc.fr/item/MZM_1972_11_1_a2/
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     title = {An example of a torsion-free nilpotent group having no outer automorphisms},
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Voir la notice de l'article provenant de la source Math-Net.Ru

A negative answer is given to a question posed by E. Schenkman and F. Haimo: does every torsion-free nilpotent group have an outer automorphism?