def get_publication_number(line):
    """
    Return the publication number based on a row from the EPO full-text bulk dataset
    :param line: str, E.g. EP  0700059 A1  1996-03-06  de  TITLE   Elektroma ...
    :return: str, E.g. EP-0700059-A1
    """
    return "-".join(line.split("\t")[:3])