@other{https://resolver.caltech.edu/CaltechTHESIS:04112011-104242807,
    title = "Comparison of the properties of cholinergic differentiation factors and examination of their possible role in vivo",
    year = "1991",
    url = "https://resolver.caltech.edu/CaltechTHESIS:04112011-104242807",
    id = "record",
    doi = "10.7907/9ffk-0t58"
}