Santas, L.A. 1988 Physokermes hemicryphus (Dalman) a fir scale insect useful to apiculture in Greece.. Entomologia Hellenica 6: 11-22.

Notes: Summary/abstract in: English & Greek. Abstract: Important honeydew-producing scale; mostly on Abies cephalonica; biology; parasites & predators; population density.