Swedish author and doctor Bea Uusma dedicated huge part of her life researching and writing about the expedition. This seems to be the english version of her renowned book:
https://www.amazon.com/Expedition-Solving-Mystery-Polar-Tragedy/dp/1781859639
Here's a cheap digital copy: https://www.bokus.com/bok/9781781859612/expedition/
She basically became a medical doctor just to learn more about the case (as well as getting access to tissue samples), including learning stenography to be able to dictate the logs without using a middleman. She is without doubt the greatest expert in this field.
Unfortunately both her podcast about the expedition is in Swedish.