Smartphone Usability Supporting Documents

Continuing to research Smartphone Usability and developing possible tasks and sites to conduct the test on. Meanwhile, also searching for supporting documentation and similar studies. I've come across the following:

Usability in mobile interface browsing - Meikang Qiua,, Kang Zhang and Maolin Huang
This study is a strong start but there are several differences between this study and the one I am proposing. They used emulators and only conducted tests on reading documentation rather then complete tasks. The test I am drafting will be to complete everyday tasks on an actual smartphone.

How Younger and Older Adults Master the Usage of Hyperlinks in Small Screen Devices - Martina Ziefle, Ulrik Schroeder, Judith Strenk and Thomas Michel
Just found this document so I still need to read through it however the title seems promising to provide some base numbers and reference points.