Articles (2)
- Rainer Hutterer, Fritz Dieterlen, Gerhard [Niko] Nikolaus (1992): Small mammals from forest islands of eastern Nigeria and adjacent Cameroon, with systematical and biogeographical notes – Bonn zoological Bulletin - früher Bonner Zoologische Beiträge. – 43: 393 - 414.
- Gerhard [Niko] Nikolaus (1987): Distribution atlas of SudanŽs birds with notes on Habitat and Status – Bonner zoologische Monographien – 25: 1 - 322.