+@Article{horsfield96,
+ title = "Bond-order potentials: Theory and implementation",
+ author = "A. P. Horsfield and A. M. Bratkovsky and M. Fearn and
+ D. G. Pettifor and M. Aoki",
+ journal = "Phys. Rev. B",
+ volume = "53",
+ number = "19",
+ pages = "12694--12712",
+ numpages = "18",
+ year = "1996",
+ month = may,
+ doi = "10.1103/PhysRevB.53.12694",
+ publisher = "American Physical Society",
+}
+
+@Article{abell85,
+ title = "Empirical chemical pseudopotential theory of molecular
+ and metallic bonding",
+ author = "G. C. Abell",
+ journal = "Phys. Rev. B",
+ volume = "31",
+ number = "10",
+ pages = "6184--6196",
+ numpages = "12",
+ year = "1985",
+ month = may,
+ doi = "10.1103/PhysRevB.31.6184",
+ publisher = "American Physical Society",
+}
+