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3Rhif Galw: Se/216/Ber1/1Erthygl
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9gan Brodsky, Joel; Lauritsen, John; Bernard, Frits; Brongersma, Edward; Sandfort, Theo; Schérer, René; Schmitt, Arno
Cyhoeddwyd 1987Rhif Galw: So/117/Int/1-2Llyfr -
10Cyhoeddwyd 1972Awduron Eraill: “...Bernard, Frits...”
Rhif Galw: Se/216/Ber2/1Llyfr