Donovan, Callomon and Howarth 1981 Classification of the Jurassic Ammonitina; Systematics Association.

Systematics Association Special Volume 6.

Systematics Association pub.

Classification of the Jurassic Ammonitina; Systematics Association.

In contrast, the authoritative glossary attached to the textbook on Biological Nomenclature produced by the Systematics Association displays a very dismissive attitude to the question; for example, the only relevant entries it presents on the subject of the term sensu are:

Such entries suggest that the Systematics Association is not concerned with hair-splitting in the use of the Latin terms.

Telling the Evolutionary Time: Molecular Clocks and the Fossil Record (Systematics Association Special Volume) by Philip C J Donoghue and M. Paul Smith (page 227)

The Ammmonoidea; Systematics Association.

London: Published for the Systematics Association by Academic Press.