added some literature

diff --git a/bibdb/bibdb.bib b/bibdb/bibdb.bib
index e34a61030c14362e51428adac24de63d35753dda..651490cc9a7bb249fc1363c27fb53bb1b6ea105d 100644 (file)
--- a/bibdb/bibdb.bib
+++ b/bibdb/bibdb.bib
@@ -6780,6 +6780,21 @@
   publisher =    "American Physical Society",
 }
 
+@Article{chelikowsky94,
+  title =        "Finite-difference-pseudopotential method: Electronic
+                 structure calculations without a basis",
+  author =       "James R. Chelikowsky and N. Troullier and Y. Saad",
+  journal =      "Phys. Rev. Lett.",
+  volume =       "72",
+  issue =        "8",
+  pages =        "1240--1243",
+  year =         "1994",
+  month =        feb,
+  doi =          "10.1103/PhysRevLett.72.1240",
+  URL =          "http://link.aps.org/doi/10.1103/PhysRevLett.72.1240",
+  publisher =    "American Physical Society",
+}
+
 @Article{saad10,
   author =       "Y. Saad and J. Chelikowsky and S. Shontz",
   title =        "Numerical Methods for Electronic Structure
@@ -6829,3 +6844,48 @@
   URL =          "http://link.aps.org/doi/10.1103/PhysRevB.69.075101",
   publisher =    "American Physical Society",
 }
+
+@Article{li93,
+  title =        "Density-matrix electronic-structure method with linear
+                 system-size scaling",
+  author =       "X.-P. Li and R. W. Nunes and David Vanderbilt",
+  journal =      "Phys. Rev. B",
+  volume =       "47",
+  issue =        "16",
+  pages =        "10891--10894",
+  year =         "1993",
+  month =        apr,
+  doi =          "10.1103/PhysRevB.47.10891",
+  URL =          "http://link.aps.org/doi/10.1103/PhysRevB.47.10891",
+  publisher =    "American Physical Society",
+}
+
+@Article{mauri93,
+  title =        "Self-consistent first-principles technique with linear
+                 scaling",
+  author =       "E. Hern\'andez and M. J. Gillan",
+  journal =      "Phys. Rev. B",
+  volume =       "51",
+  issue =        "15",
+  pages =        "10157--10160",
+  year =         "1995",
+  month =        apr,
+  doi =          "10.1103/PhysRevB.51.10157",
+  URL =          "http://link.aps.org/doi/10.1103/PhysRevB.51.10157",
+  publisher =    "American Physical Society",
+}
+
+@Article{hernandez95,
+  title =        "Self-consistent first-principles technique with linear
+                 scaling",
+  author =       "E. Hern\'andez and M. J. Gillan",
+  journal =      "Phys. Rev. B",
+  volume =       "51",
+  issue =        "15",
+  pages =        "10157--10160",
+  year =         "1995",
+  month =        apr,
+  doi =          "10.1103/PhysRevB.51.10157",
+  URL =          "http://link.aps.org/doi/10.1103/PhysRevB.51.10157",
+  publisher =    "American Physical Society",
+}