47893
The introduction of simple auxiliary terms , due to Gauss , and Ernst Abbe showed that the properties of these reproductions , " i .
 Gauss, Ernst Abbe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Gauss, Ernst Abbe