Depending on the document DOI, your institution's paid access to online document sources, and your IP address, you may see the following buttons on a Reference Detail page.
If the full-text version is HTML, the button will be labeled View Source rather than View PDF. A green center denotes access to the paid version of the HTML/PDF.
| Not entitled by the publisher to see the paid version of the document HTML/PDF. Clicking this button displays a page similar to reference's DOI page, and you can purchase the information there. | |
| Entitled by the publisher to see the paid version of the document HTML/PDF. Clicking this button will typically authenticate you with the publisher and open the paid version of the HTML/PDF. | |