by Maggioni, L | Lipman, E | Hammer, K | Ambrose, M | von Bothmer, R | Knüpffer, H.
by Begemann, F.; Hammer, K [editor].
by Perrino, P | Hammer, K | Knüpffer, H | Laghetti, G.
by Hammer, K.; Laghetti, G [editor].
by Hammer, K | Laghetti, G | Knüpffer, H.
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