@Book{OL5292947M,
    title: {Div, grad, curl, and all that},
    author: {H. M. Schey},
    publisher: {Norton},
    year: {1973},
    place: {New York},
}

@Author{OL528126A,
    name: {H. M. Schey},
    birth_date: {1930}
}