Davidson, Alistair; Grace, Anthony J.; Schwarz, Eckart W.; Vickers, Colin (2002). "The Value of the Certificate of Pharmaceutical Product in Registration of Medicinal Products". Drug Information Journal. 36: 163–167. doi:10.1177/009286150203600121. S2CID72121284.
Davidson, Alistair; Grace, Anthony J.; Schwarz, Eckart W.; Vickers, Colin (2002). "The Value of the Certificate of Pharmaceutical Product in Registration of Medicinal Products". Drug Information Journal. 36: 163–167. doi:10.1177/009286150203600121. S2CID72121284.