4923
Background Isobaric Counterdiffusion was first described by Graves , Idicula , Lambertsen , and Quinn in 1973 in subjects who breathed one inert gas mixture ( nitrogen or neon ) while being surrounded by another ( helium ) .
 person: Lambertsen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Lambertsen