License: This license allows open use of the content in the course for educational purposes, provided that attribution is made to the original source of the material. The content may be reused and mixed to create new educational content with this proviso and with the two following stipulations: 1) the content may not be used for commercial purposes, and 2) the content may not appear under a license that is more restrictive to users than this one. For additional information concerning this license, see http://www.creativecommons.org/licenses/.

© 2009, Kwame Nkrumah University of Science and Technology.