Disselkamp, C. 1954 Die Schildbildung der San José-Schildlaus (Quadraspidiotus perniciosus Comst. 1881). [The scale formation of San José scale (Quadraspidiotus perniciosus Comst.)]. Höfchen-Briefe (Bayer Pflanzenschutz- Nachrichten) 7: 109-155.

Notes: Detailed study of the secretions forming the scale, of the organs forming the secretions and of the physiology of the scale insect under certain contolled conditions. English version, ibid. 7: 105-151.