✓

@book{5598232,
    title = {Le Grotte di Frasassi},
    author = {unknown},
    year = {2012},
    url = {libgen.li/file.php?md5=9ddd7daf9734f10b02b888fc92fba84f},
    date-added = {2025-9-25 19:36:40 +0100}
}

@book{5598232, title = {Le Grotte di Frasassi}, author = {unknown}, year = {2012}, url = {libgen.li/file.php?md5=9ddd7daf9734f10b02b888fc92fba84f}, date-added = {2025-9-25 19:36:40 +0100} }