Šulc, K. 1932 Ceskoslovenské druhyrodupuklice (gn. Lecanium, Coccidae, Homoptera). Die Tschechoslowakischen Lecanium-Arten.. Acta Societatis Scientiarum Naturalium Moravicae 7: 1-134.

Notes: A critical detailed study of the anatomy and classification of 10 Bohemian Lecanium species, with keys to subgenera and some species.