I found a link to a genealogical doctoral thesis on the following subject that might interest the Nobility of the Grand Duchy of Lithuania. The full title of the thesis is "Genealogical Identity among the Nobility of the Grand Duchy of Lithuania and its expression in the heraldry of the 16th-18th centuries"
The link for the article is:
All the best
Sweet! I posted it under resources in the category for Lithuanian Nobility: