| Auteur(s) | Popov, V.B. |
| Jaar | 1956 |
| Titel | The bees, their associations with angiosperm plants and the problem of alfalfa pollination. Entomologicheskoe Obozrenie 35(3): 582–598. |
| Auteur(s) | Popov, V.B. |
| Jaar | 1956 |
| Titel | The bees, their associations with angiosperm plants and the problem of alfalfa pollination. Entomologicheskoe Obozrenie 35(3): 582–598. |