Why do the PDF download links expire?
The download link is specially generated for you and is unique to your purchase. You should download your article as soon as possible. You should not disseminate the link. • I have lost my download link. Please login to your Google checkout account, and select your purchase with Computational Technology Resources from the list. This will lead you to a confirmation page that includes the download link. Please note that the download link will only remain active for 72 hours after your purchase. If this period has expired and you have not downloaded the PDF of your article, please contact us. • The download link does not work. Please contact us within 72 hours from your purchase. We will attempt to provide you with the article by email. If, however, due to our fault the article is still not available, we will issue a full refund to your credit card. • I have purchased the wrong article. Computational Technology Resources is unable to accept returns of downloaded articles. Please ensure th
