The Nintendo 3DS console uses CIA files to distribute and install games and applications. However, some users and developers may need to extract or convert CIA files to other formats, such as 3DS. The 3DS file format is a 3D model file used in various applications, including computer-aided design (CAD), computer-generated imagery (CGI), and video games. Converting CIA files to 3DS format can be useful for developers who want to modify or reuse 3D models from 3DS games and applications.

You're looking for a paper on converting CIA (CTR Importable Archive) files to 3DS (3D Model File) files, specifically a portable converter. I'll provide a general outline, and you can use it as a starting point for your research.

A Portable CIA to 3DS File Converter