Heywood VH (1972) Flora Europaea: Notulae Systematicae ad Floram Europaeam spectantes: No. 12. Botanical Journal of the Linnean Society 65(2): 223-269. doi: 10.1111/j.1095-8339.1972.tb00935.x.
There is no corrections for Cerinthe glabra subsp. smithiae yet.