Here's a potential paper you might find helpful:
The software uses a phonetic-based approach to map Bengali characters to keyboard layouts. The design involves creating a custom keyboard layout that takes into account the linguistic and cultural aspects of the Bengali language. The implementation was done using programming languages such as C++ and Java. bijoy bayanno 2016 free download
I'm assuming you're looking for a paper related to Bijoy Bayanno 2016, a Bengali keyboard layout software, and you want to download it for free. Here's a potential paper you might find helpful: