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Achterberg, C. v. 1993: [Vecht, J. van der] Entomologische Berichten, Amsterdam 53 (4), B15 10146a, pp. 41-43, Portr.
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Bohart, R. M. 1993: [Vecht, J. van der] Sphecos. A Newsletter (= Forum) for Aculeate Wasp Researchers., Washington 24 (2), B15 11907, pp. 8
Kojima, Jun-ichi; Achterberg, K. v. 1998: [Vecht, J. van der] Natural History Bulletin of Ibaraki University., 2, B15 12242, pp. 228 (Ergänzung zum Schr.verz.)
Krombein, K. V. 1993: [Vecht, J. van der] Sphecos. A Newsletter (= Forum) for Aculeate Wasp Researchers., Washington 24 (2), B15 11907, pp. 7-8
West-Eberhard, M. J. 1993: [Vecht, J. van der] Sphecos. A Newsletter (= Forum) for Aculeate Wasp Researchers., Washington 24 (2), B15 11907, pp. 8-9