Since the book was released over 20 years ago, finding a digital copy (PDF/DjVu) or a physical one can be challenging:
How to port models between different game engines.
The book you are looking for is (Russian: "gmax: настольная книга" ) written by Clayton E. Crooks II .
Some academic or technical sites, such as K. Polyakov's School Page , list it as a primary reference for 3D modeling. Key Content