@Book{OL35495M,
    title: {The art of getting over},
    author: {Powers, Stephen},
    publisher: {St. Martin's Press},
    year: {1999},
    place: {New York},
}

@Book{OL1474864M,
    title: {Encyclopedic dictionary of mathematics},
    author: {Kiyosi Itō},
    publisher: {MIT Press},
    year: {1993},
    place: {Cambridge, Mass},
}

@Book{OL35675912M,
    title: {Harry Potter and the Deathly Hallows},
    author: {J. K. Rowling},
    publisher: {Arthur A. Levine Books an imprint of Scholastic Inc.},
    place: {New York},
}

@Author{OL23919A,
    name: {J. K. Rowling},
    birth_date: {31 July 1965}
}