message: Documentation: added Solver references.
diff: @@ -19,7 +19,17 @@ You may use e.g. the following TeX code:
  The following need only be cited if used.
  -**SIB Method**
  +**Depondt Solver**
  +
  +This Heun-like method for solving the LLG equation including the
  +stochastic term has been published by Depondt et al.:
  +http://iopscience.iop.org/0953-8984/21/33/336005
  +You may use e.g. the following TeX code:
  +
  + \bibitem{Depondt}
  + Ph. Depondt et al. \textit{J. Phys. Condens. Matter} \textbf{21}, 336005 (2009).
  +
  +**SIB Solver**
  This stable method for solving the LLG equation efficiently and
  including the stochastic term has been published by Mentink et al.:
  @@ -29,6 +39,15 @@ You may use e.g. the following TeX code:
  \bibitem{SIB}
  J. H. Mentink et al. \textit{J. Phys. Condens. Matter} \textbf{22}, 176001 (2010).
  +**VP Solver**
  +
  +This intuitive direct minimization routine has been published as
  +supplementary material by Bessarab et al.:
  +http://www.sciencedirect.com/science/article/pii/S0010465515002696
  +You may use e.g. the following TeX code:
  +
  + \bibitem{VP}
  + P. F. Bessarab et al. \textit{Comp. Phys. Comm.} \textbf{196}, 335 (2015).
  **GNEB Method**
  @@ -38,7 +57,7 @@ http://www.sciencedirect.com/science/article/pii/S0010465515002696
  You may use e.g. the following TeX code:
  \bibitem{GNEB}
  - P. F. Bessarab et al. \textit{Comp. Phys. Commun.} \textbf{196}, 335 (2015).
  + P. F. Bessarab et al. \textit{Comp. Phys. Comm.} \textbf{196}, 335 (2015).
  ### Papers
  