Please note:

• To use the pay-per-view feature, you have to create an account on ScienceDirect.
• There's a purchase limit of 20 articles in one transaction in a 24 hour period.
• Other payment methods (e.g., wire transfer, PayPal or direct deposit) are not available.
• ScienceDirect does not support credit card purchases from Ivory Coast, Lebanon, Lithuania, and Nigeria.
• ScienceDirect only accepts US dollars currency for credit cards.