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The collection of poetry A ribbon of poems ( 23 poems ) received a good review by critic J.H. van Hall in the Dutch literary magazine " The Gids " ; Van Hall compared Couperus ' poetry with those written by Heinrich Heine , Everhardus Johannes Potgieter and Pieter Corneliszoon Hooft ; Jan ten Brink , Couperus ' teacher and later professor at the University of Leiden drew comparisons with Constantijn Huygens .
 Couperus, Heinrich Heine, Everhardus Johannes Potgieter, Pieter Corneliszoon Hooft, Couperus, University of Leiden, Constantijn Huygens
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Couperus, Heinrich Heine, Everhardus Johannes Potgieter, Pieter Corneliszoon Hooft, Couperus, University of Leiden, Constantijn Huygens