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This issue of the International Journal of Quantum Chemistry features contributions from a selection of invited and keynote speakers at the 13th V. A. Fock Meeting on Quantum and Computational Chemistry. Held in April 2012 in Astana, Kazakhstan, the meeting covered a wide range of topics in computational chemistry from fundamental theoretical developments to their applications to structure dynamics, reactivity, solid state science, and biophysics. This variety of subjects is reflected in the current issue, edited by Andrei L. Tchougréeff. The logo of the meeting displayed on the cover is used at the request of the meeting organizers.