Authors: Frank Ferraro and Jason Eisner.
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Last change: = $last_mod?date("F jS, Y H:i", $last_mod):"18 August 2011" ?>
The source code is released here under the GNU Affero 3.0 license.
The lesson text and materials are licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
To refer to this work, cite the paper that describes it (Ferraro & Eisner, 2013).