Add references

docs/index.rst

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-# SALib #
-### Sensitivity Analysis Library in Python (Numpy). Contains Sobol, Morris, and FAST methods. ###
+==============================================
+SALib - Sensitivity Analysis Library in Python 
+==============================================
+
+Python implementations of commonly used sensitivity analysis methods, including
+Sobol, Morris, and FAST methods. Useful in systems modeling to calculate the
+effects of model inputs or exogenous factors on outputs of interest.
+
+Supported Methods
+-----------------
+* Sobol Sensitivity Analysis [`Sobol 2001 <http://www.sciencedirect.com/science/article/pii/S0378475400002706>`_], [`Saltelli 2002 <http://www.sciencedirect.com/science/article/pii/S0010465502002801>`_], [`Saltelli et al. 2010 <http://www.sciencedirect.com/science/article/pii/S0010465509003087>`_]
+* Method of Morris, including groups and optimal trajectories ([Morris 1991](http://www.tandfonline.com/doi/abs/10.1080/00401706.1991.10484804), [Campolongo et al. 2007](http://www.sciencedirect.com/science/article/pii/S1364815206002805))
+* Fourier Amplitude Sensitivity Test (FAST) ([Cukier et al. 1973](http://scitation.aip.org/content/aip/journal/jcp/59/8/10.1063/1.1680571), [Saltelli et al. 1999](http://amstat.tandfonline.com/doi/abs/10.1080/00401706.1999.10485594))
+* Delta Moment-Independent Measure ([Borgonovo 2007](http://www.sciencedirect.com/science/article/pii/S0951832006000883), [Plischke et al. 2013](http://www.sciencedirect.com/science/article/pii/S0377221712008995))
+* Derivative-based Global Sensitivity Measure (DGSM) ([Sobol and Kucherenko 2009](http://www.sciencedirect.com/science/article/pii/S0378475409000354))
+* Fractional Factorial Sensitivity Analysis ([Saltelli et al. 2008](http://www.wiley.com/WileyCDA/WileyTitle/productCd-0470059974.html))
+
+
+