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Substantial progress in acoustics , resting on firmer mathematical and physical concepts , was made during the eighteenth century by Euler ( 1707 – 1783 ) , Lagrange ( 1736 – 1813 ) , and d'Alembert ( 1717 – 1783 ) .
 Euler, Lagrange, d'Alembert
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Euler, Lagrange, d'Alembert