Barb, A.A. (1953). "Diva Matrix: A Faked Gnostic Intaglio in the Possession of P.P. Rubens and the Iconology of a Symbol". Journal of the Warburg and Courtauld Institutes. 16 (3/4): 193–238. doi:10.2307/750365. JSTOR750365. S2CID195029841.
Barb, A.A. (1953). "Diva Matrix: A Faked Gnostic Intaglio in the Possession of P.P. Rubens and the Iconology of a Symbol". Journal of the Warburg and Courtauld Institutes. 16 (3/4): 193–238. doi:10.2307/750365. JSTOR750365. S2CID195029841.
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Barb, A.A. (1953). "Diva Matrix: A Faked Gnostic Intaglio in the Possession of P.P. Rubens and the Iconology of a Symbol". Journal of the Warburg and Courtauld Institutes. 16 (3/4): 193–238. doi:10.2307/750365. JSTOR750365. S2CID195029841.