Before revision:  However, the high deployment of devices such as smartphones and tablets has given rise to new and thriving scenarios where signatures can be performed using not only a pen stylus but also the finger  . Some preliminary studies have highlighted the challenge of this new scenario and the necessity of further research on the topic.
After revision:  However, the high deployment of devices such as smartphones and tablets has given rise to new and thriving scenarios where signatures can be performed using not only a pen stylus but also the finger via touch interaction . Some preliminary studies have highlighted the challenge of this new scenario and the necessity of further research on the topic.