There is a new ADP interatomic potential reported for Zr-Nb system here: Smirnova, D. E., and S. V. Starikov (2017), An interatomic potential for simulation of Zr-Nb system, Computational Materials Science, 129, 259-272; This ADP formalism is mostly based on the EAM, and the potential is applicable for simulation of HCP random Zr-Nb alloys (see the Ref).