1. Alsen, P. , 2006, The Early Cretaceous (Late Ryazanian–Early Hauterivian) Ammonite Fauna of North-East Greenland: Taxonomy, Biostratigraphy, and Biogeography: Fossils and Strata Number 53, 229 p.
2. Description of a new Bajocian (Middle Jurassic) ammonite species, Cranocephalites tvaerdalensis sp. nov., from Geographical Society Ø, north-east Greenland;Alsen;Geological Survey of Denmark and Greenland Bulletin,2015
3. The Early Cretaceous of north-east Greenland;Alsen;A crossroads of belemnite migration: Palaeogeography, Palaeoclimatology, Palaeoecology,2009
4. The Early Valanginian Early Cretaceous ammonite Delphinites (Pseudogarnieria) from north-east Greenland;Alsen;Bulletin of the Geological Society of Denmark,2005
5. Maximum Middle Jurassic transgression in East Greenland: Evidence from new ammonite finds, Bjørnedal, Traill Ø;Alsen,2004