Perhaps the most significant developments have been in narratology, the study of how storytelling works, since this combines empirical linguistic study with literary criticism. Irene de Jong's 1987 "Narrators and Focalizers: The Presentation of the Story in the Iliad" draws on the work of the theorist Mieke Bal, and de Jong followed this up in 2001 with her "Narratological Commentary on the Odyssey"; Bakker has published several linguistic-narratological studies, especially his 1997 "Poetry as Speech"; and Elizabeth Minchin's 2001 "Homer and the Resources of Memory" draws on several forms of narratology and cognitive science, such as the script theory developed in the 1970s by Roger Schank and Robert Abelson.