Documentation update.
Change-Id: Ic5f209da760562aa89a822f7e5853c5639a427eb
diff --git a/docs/ceres-solver.bib b/docs/ceres-solver.bib
index 09de30d..1bb1996 100644
--- a/docs/ceres-solver.bib
+++ b/docs/ceres-solver.bib
@@ -1,3 +1,31 @@
+@article{ruhe-wedin,
+ title={Algorithms for separable nonlinear least squares problems},
+ author={Ruhe, A. and Wedin, P.{\AA}.},
+ journal={Siam Review},
+ volume={22},
+ number={3},
+ pages={318--337},
+ year={1980},
+ publisher={SIAM}
+}
+@article{golub-pereyra-73,
+ title={The differentiation of pseudo-inverses and nonlinear least squares problems whose variables separate},
+ author={Golub, G.H. and Pereyra, V.},
+ journal={SIAM Journal on numerical analysis},
+ volume={10},
+ number={2},
+ pages={413--432},
+ year={1973},
+ publisher={SIAM}
+}
+
+@inproceedings{wiberg,
+ title={Computation of principal components when data are missing},
+ author={Wiberg, T.},
+ booktitle={Proc. Second Symp. Computational Statistics},
+ pages={229--236},
+ year={1976}
+}
@book{conn2000trust,
title={Trust-region methods},
author={Conn, A.R. and Gould, N.I.M. and Toint, P.L.},
