Krzysztofowicz, A. 1957 L'addition a la faune d'aspidiotini de la Pologne (Homoptera, Coccoidea, Aspidiotini).. Zeszyty Naukowe Uniwersytetu Jagiellonskiego 10: 223-240.

Notes: [Summaries in French and Russian]; Redescribes Quadraspidiotus piri and Q. marani and compares them with Q. perniciosus and Q. ostreaeformis; biology; hosts.