38124
They were very important in computational chemistry from the 60 s to the 90 s , especially for treating large molecules where the full Hartree–Fock method without the approximations were too costly .
 Hartree–Fock
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hartree–Fock