Articles (4)
- Christian Schmid-Egger, Piotr Olszewski (2023): A new species of Cryptocheilus PANZER, 1806 from Ethiopia (Hymenoptera, Pompilidae) – Linzer biologische Beiträge – 0055_2: 701 - 704.
- Current list of the Polish digger wasps (Hymenoptera, Spheciformes)Piotr Olszewski, Bogdan Wisniowski, Toshko Ljubomirov (2021): Current list of the Polish digger wasps (Hymenoptera, Spheciformes) – Spixiana, Zeitschrift für Zoologie – 44: 81 - 107.
- Piotr Olszewski, David G. Notton, Ian J. Kitching (2020): Review of the genus Dinetus Panzer, 1806 (Hymenoptera: Crabronidae: Dinetinae) with descriptions of new subgenera and new species – Arthropod Systematics and Phylogeny – 78: 361 - 377.
- Tadeusz Pawlikowski, Piotr Olszewski, Waldemar Zyla, Magdalena Przybylinska (2016): Scientific note: The rare oligolectic bumblebee Bombus gerstaeckeri Morawitz, 1882 from Poland (Hymenoptera, Apidae) – Spixiana, Zeitschrift für Zoologie – 039: 130.