Wahl, B. 1933 Die San José-Laus (Aspidiotus perniciosus) und deren Auftreten in Europa. [The San José scale (Aspidiotus perniciosus) and its occurrance in Europe.]. Ve Congrès International d'Entomologie. [5th International Congress of Entomology] 5th: 693-698.

Notes: [Conference held July 18-24, 1932 in Paris, France.]