Based on your request, here are some useful papers regarding mobile keyboards, focusing on virtual, physical, and adaptive text entry systems:
(2010) offers a comprehensive overview of mobile text entry research, covering Fitts' Law, evaluation methodologies, and comparisons between layouts. Optimization & Autocorrect Keyboard Mobile
(2019) models the effect of user aversion to errors, revealing a speed limit despite high-accuracy autocorrection. Physical and Novel Keyboards Based on your request, here are some useful
(2021) analyzes how users develop typing strategies, including eye-hand coordination and location memory for QWERTY layouts. Based on your request