121366
This approach was extended to N-slit interferometers , by Duarte and colleagues in 1989 , using narrow-linewidth laser illumination , that is , illumination by indistinguishable photons .
 Duarte
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Duarte