@other{https://resolver.caltech.edu/CaltechTHESIS:08272010-083731520,
    title = "Experimental study of shock wave strengthening by a positive density gradient in a cryogenic shock tube",
    url = "https://resolver.caltech.edu/CaltechTHESIS:08272010-083731520",
    id = "record",
    doi = "10.7907/ZXBM-7809"
}