@Book{OL16454790M,
    title: {The Sherlock Holmes Companion},
    author: {Michael Hardwick and Mollie Hardwick},
    publisher: {Bramhall House},
    year: {1976},
    place: {New York, USA},
}

@Author{OL838212A,
    name: {Michael Hardwick},
    birth_date: {10 September 1924}
    , death_date: {4 March 1991}
}
@Author{OL858028A,
    name: {Mollie Hardwick},
    birth_date: {1916-03-07}
    , death_date: {2003-12-13}
}