H., Bartenstein: Paleontological zonation. Parallelisation of the Lower Cretaceous Stages in north west Germany with index ammonites and index microfossils, Erdol u. Kohle, Erdgas, Petrochemie, 31/2, 65-67, 1978a.
H., Bartenstein: Phylogenetic sequences of Lower Cretaceous benthic foraminifera and their use in biostratigraphy, Geologie Mijnb., 57, 19-24, 1978b.
H., Bartenstein: Worldwide zonation of the Lower Cretaceous using benthonic foraminiferaNewslStratigr., Stuttgart, 7 (3), 142–154., 1979.
H., Bartenstein and M., Kaever: Die UnterKreide von Helgoland und Ihre Mikropalaeontologische GliederungSenckenbergLeth54, 2–4, 107–164Frankfurt., 1973.
H., Bartenstein and H. J., Oertli:
Textularia bettenstaedti n.sp., approved benthonic index foraminifera in the Central European Lower CretaceousNeuesJbGeolPalaontMh., 4–1, 15–24, Stuttgart., 1977.
S., Crittenden: Palaeocene and Eocene planktonic foraminifera from borehole 49/24-2 southern North Sea, UnpublM.Scthesis, Univof Wales, Aberystwyth, 136 pp, 7 pls., 1979.
S., Crittenden: Lower Cretaceous lithostratigraphy N.Eof the Sole Pit area in the U.Ksouthern North SeaJournPetroleum geol., London, 5, 2, 191–201., 1982a.
S., Crittenden: Rotaliine foraminiferids from the type section of the Atherfield “Group” (Lower Aptian), Isle of Wight, U.K., J. micropalaeontol., 1, 23-36, 1982b.
S., Crittenden: A foraminiferal analysis of the Atherfield Clay (Lower Aptian) of the Isle of Wight, U.K., with special emphasis on the arenaceous speciesIn: First Workshop on Arenaceous Foraminiferids, Amsterdam 1981, I.K.Upublication108, 9–29, 2 pls., 1983a.
S., Crittenden:
Osangularia schloenbachi (Reuss, 1863), an index foraminiferid species from the Middle Albian to Late Aptian of the southern North Sea, Neues. Jb. Geol. Palaont. Abh., 167/1, 40-64, 1983b.
S., Crittenden:
The Lenticulina (Astacolus) humilis (Reuss, 1863) group and
Lenticulina (Astacolus) atherfieldensis (new species) in the Lower Aptian of the Isle of Wight (U.K.), Cretaceous Research, 4, 349-359, 1983c.
S., Crittenden: A preliminary account of Aptian benthic foraminifera from the southern North Sea (U.K. Sector), Benthos ’83, Second International Symposium on Benthic foraminifera. Bull. Cent. Rech. EPEA., Mem 6, 185-190, 1984a.
S., Crittenden: A note on the Early Cretaceous biostratigraphy (Foraminifera) of borehole 49/24-1 (Shell/Esso) in the southern North Sea, J. micropalaeontol., 3, 1-10, 1984b.
S., Crittenden: The Albian transgression in the southern North Sea Basin, Journ. Petroleum geol
C. E., Deegan and B. J., Scull: A standard lithostratigraphic nomenclature for the Central and northern North Sea, Rep. Inst. Geol. Sci., 1, 1-36, 1977.
W., Eichenberg: Microfaunen-Tafels zur Bestimmung von UnterKreide-Horizonten in Bohrkernen norddeustscher oelfelder, Oel und Kohle, 2, 1935.
F. E., Hecht: Standard Gliederung der Nordwestdeutschen Unter Kreide nach Foraminifera, Abh. Senckenb. naturforsch. Ges., 443, 1-42, 1938.
A., Hesjedal and G. P., Hamer: Lower Cretaceous stratigraphy and tectonics of the south-southeastern Norwegion offshore
In: (eds.):
Petroleum geology of the southeastern North Sea and the adjacent onshore areas (The Hague, 1982),
Geologie Minjb., 62, 135–144., 1983.
E., Kemper: The Aptian and Albian stages in northwest GermanyIn: The Boreal Lower Cretaceous (Casey, Rand Rawson, PFed.) GeolJSpecIss., 5, 345–360Liverpool., 1973.
E., Kemper: Die UnterKreide NordwestdeutschlandsEin UberblickAspekte der Kreide EuropasIUGS Series A., No6, 1–9Stuttgart., 1979.
E., Kemper, P. F., Rawson, C., Schmid and Chr., Spaeth: Die Megafauna der Kreide von Helgoland und ihre biostratigraphische Deutung,
NewslStratigr., Stuttgart, 3, 121–137., 1974.
L. B., Rasmussen: Geological aspects of the Danish North Sea Sector, Denmarks geologiske Undersgelse (3), 44, 4-85, 1978.
P. F., Rawson: The Valanginian to Aptian stages – current definitions and outstanding problemsZitteliana, 10, 493–500Munich., 1983.
G. H., Rhys: (Compiler)A proposed standard lithostratigraphical nomenclature for the whole of the U.KNorth SeaA report of the joint Oil Industry-Institute of Geological Sciences Committee on North Sea NomenclatureRepInstGeolSci., London, 73/8, 14 pp., 1974.
P. A., Ziegler: Geological Atlas of Western and Central EuropeShell Internationale Petroleum Maatschappÿ BV., 1–130, 40 enclosuresElsevier Scientific publishing CoAmsterdam., 1982.