Robert D. Nicholls

Recombination within the human embryonic ζ-globin locus: A common ζ-ζ chromosome produced by gene conversion of the ψζ gene

A. Hill, D. Higgs, S. Thein, 1985, Cell.

Recombination at the human α-globin gene cluster: Sequence features and topological constraints

D. Higgs, R. Nicholls, N. Fischel‐Ghodsian, 1987, Cell.