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Help-notes towards the determination and classification of the European Myrmeleonidae

Published in Entomologiske Meddelelser, in 1919, in volume 12, pages 97-127

The European Trichogramminae

Published in Entomologiske Meddelelser, in 1919, in volume 12, pages 257-354

Description of a new species of Nematocera Polyneura from Denmark with notes concerning some other species

Published in Entomologiske Meddelelser, in 1919, in volume 13, pages 12-16