Ars Amatoria
During a distinguished academic career his research focused mainly on Hellenistic and Roman poetry. He wrote many important articles on the fragmentary poems of Callimachus and published a full-length commentary on the "Hecale" in 1990 (second edition 2009, with translation), but also ranged over authors as diverse as Euphorion, Choerilus, Lycophron, Horace, Propertius and Virgil. He also published a commentary on Ovid "Metamorphoses" VIII (1970) and "Ars Amatoria" I (1977), and an edition of "Fragments of Roman Poetry, c. 60 BC-AD 20 " (2007).