264959
Works He wrote more than one hundred works , including a Systhema theologiae ( Groningen , 1645 ; 4th ed. , 1673 , with an appendix giving a list of his writings ) , worked out in scholastic fashion , which was much used as a text-book .
 Groningen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Groningen