def extract_authors(elem):
    """extract the authors from an xml element

    Args:
        elem (xml): xml element

    Returns:
        tuple: containing a dictionary with authors 
    """
    authors = list(elem)
    authors = {"Authors":
               ", ".join(["{} {}"
                          .format((((author.find("LastName") != None) and author.find("LastName").text) or ""),
                                  (((author.find("Initials") != None) and author.find("Initials").text) or "")) for author in authors])}
    return (authors, False)