104381
In mathematics , Enriques surfaces , discovered by , are complex algebraic surface s such that the irregularity q = 0 and the canonical line bundle K is non-trivial but has trivial square .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None