Rare Tremadocian trilobites from Norway - 1959
The Middle Ordovician of the Oslo region, Norway, 16. Graptolites of the Ogygiocaris Series - 1964
The Middle Ordovician of the Oslo region, Norway, 28. Lithostratigraphy of the Steinvika Limestone Formation, Landesund-Skien district - 1980
The Middle Ordovician of the Oslo region, Norway, 33. Trilobites from the lowermost part of the Ogygiocaris Series - 1983