@other{https://resolver.caltech.edu/CaltechTHESIS:11292012-114339075,
    title = "A study of the ultrahigh-energy cosmic ray mass composition with the MACRO and EAS-TOP experiments",
    url = "https://resolver.caltech.edu/CaltechTHESIS:11292012-114339075",
    id = "record",
    doi = "10.7907/vp18-zv27"
}