Geodesic
An example of a torsion-free nilpotent group having no outer automorphisms
Matematičeskie zametki, Tome 11 (1972) no. 1, pp. 21-26

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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? 
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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/