+@Article{wigner33,
+ volume = "43",
+ journal = "Phys. Rev.",
+ author = "E. Wigner and F. Seitz",
+ month = may,
+ URL = "http://link.aps.org/doi/10.1103/PhysRev.43.804",
+ doi = "10.1103/PhysRev.43.804",
+ year = "1933",
+ title = "On the Constitution of Metallic Sodium",
+ issue = "10",
+ publisher = "American Physical Society",
+ pages = "804--810",
+ notes = "wigner seitz method",
+}
+
+@Article{herring40,
+ volume = "57",
+ journal = "Phys. Rev.",
+ author = "Conyers Herring",
+ month = jun,
+ URL = "http://link.aps.org/doi/10.1103/PhysRev.57.1169",
+ doi = "10.1103/PhysRev.57.1169",
+ year = "1940",
+ title = "A New Method for Calculating Wave Functions in
+ Crystals",
+ issue = "12",
+ publisher = "American Physical Society",
+ pages = "1169--1177",
+ notes = "orthogonalized plane wave method, opw",
+}
+