Arvo Mikkanen has prosecuted several cases involving theft from tribal communities, and served as a litigator for the federal government in the Seminole Freedmen case that went to the Tenth Circuit. Here are the published opinions from cases he worked on:
Citizen Potawatomi Nation v. Norton
And a short article co-authored by Mr. Mikkanen: Oklahoma Indian Law Attys
Turtle Talk 
He also has some published opinions as a tribal court judge.