| Name | References (Included in reference) |
|---|---|
| P. Ilinski | 11 (7) |
| P. I. Reinhardt-Nickoulin | 11 (10) |
| P. I. Volz | 6 (3) |
| P. I. Pavlishin | 5 (1) |
| P. I. Reingardt-Nikulin | 1 (0) |
| P. I. Shmidkov | 1 (1) |
| P. I. Slabodchikov | 1 (0) |
| P. Iapozzuto | 1 (0) |
| P. Imgram | 1 (1) |
| P. I. Reinhardt-Nickulin | 1 (1) |
