3459
He published a lot of personal historical works ( such as biographies of Johan Albrecht Ehrenström and K. J. Ståhlberg ) , and a few judicial histories .
 Johan Albrecht Ehrenström, K. J. Ståhlberg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Johan Albrecht Ehrenström, K. J. Ståhlberg