Add ref on dispersion corrections

Author: davidlmobley

paper/basic_training.bib

@@ -971,3 +971,16 @@ @book{Jensen2007
 title = {{Introduction to Computational Chemistry}},
 year = {2007}
 }
+
+@article{Isele-Holder:2012:J.Chem.Phys.,
+  title = {Development and Application of a Particle-Particle Particle-Mesh {{Ewald}} Method for Dispersion Interactions},
+  volume = {137},
+  issn = {0021-9606},
+  doi = {10.1063/1.4764089},
+  number = {17},
+  journal = {J. Chem. Phys.},
+  author = {{Isele-Holder}, Rolf E. and Mitchell, Wayne and Ismail, Ahmed E.},
+  month = nov,
+  year = {2012},
+  pages = {174107},
+}

paper/basic_training.tex

@@ -495,8 +495,7 @@ \subsection{Force fields}
 Thus, to replicate a particular force field as described previously, such settings should be matched to prior work such as the work which parameterized the force field.
 The choice of how to apply a cutoff, such as through direct truncation, shifting of the potential energy function, or through the use of switching functions, should be maintained if identical matches to prior work computing the properties of interest are desired.
 This is especially important for the purposes of free energy calculations, where the potential energy itself is recorded.
-However, force fields are in some cases slow to adapt to changes in protocol, so current best practices seem to suggest that lattice-sum electrostatics should be used for Coulomb electrostatics in condensed phase systems, even if the chosen force field was fitted with cutoff electrostatics, and in many cases long-range dispersion corrections should be applied to the energy and pressure to account for truncated Lennard-Jones interactions~\cite{Shirts:2007:JPhysChemB}.
-\todo[inline, color={yellow!20}]{DLM: Probably need more cites here.}
+However, force fields are in some cases slow to adapt to changes in protocol, so current best practices seem to suggest that lattice-sum electrostatics should be used for Coulomb electrostatics in condensed phase systems, even if the chosen force field was fitted with cutoff electrostatics, and in many cases long-range dispersion corrections should be applied to the energy and pressure to account for truncated Lennard-Jones interactions~\cite{Shirts:2007:JPhysChemB, Isele-Holder:2012:J.Chem.Phys.}.
 
 For almost all force fields, many versions, variants, and modifications exist, so if you are using a literature force field or one distributed with your simulation package of choice, it is important to pay particular attention (and make note of) exactly what version you are using and how you obtained it so you will be able to accurately detail this in any subsequent publications.