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In 1956 Louis Lliboutry proposed that volcanic activity may occur in fissure vents buried beneath glaciers ; between eruptions they would be concealed below the ice ; Lliboutry considered dark bands on the ice to be tephra deposits , a view supported by a 1958 - 1959 expedition that found pumice on the Viedma Glacier .
 Louis Lliboutry, Lliboutry, Viedma Glacier
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Louis Lliboutry, Lliboutry, Viedma Glacier