70574
In 1939 , an upper limit of potential element synthesis was estimated around element 104 , In 1955 , American physicist John Archibald Wheeler also proposed the existence of these elements ; he is credited with the first usage of the term " superheavy element " in a 1958 paper published with Frederick Werner .
 John Archibald Wheeler, Frederick Werner
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 John Archibald Wheeler, Frederick Werner