Neoanalysis is quite separate from 19th century Analysis. It is the study of the relationship between the two Homeric epics and the "Epic Cycle": the extent to which Homer made use of earlier poetic material about the Trojan War, and the extent to which other epic poets made use of Homer. The main obstacle to this line of research – and, simultaneously, the main impetus for it – is the fact that the Cyclic epics do not survive except in summaries and isolated fragments. Ioannis Kakridis is usually regarded as the founding figure of this school of thought, with his 1949 book "Homeric Researches", but Wolfgang Kullmann's 1960 "Die Quellen der Ilias" ("The sources of the "Iliad"") is even more influential. Neoanalytic topics have become much more prominent in English-language scholarship since 1990, notably in a series of articles by M. L. West in "Classical Quarterly" and in Jonathan Burgess' 2001 book "The Tradition of the Trojan War in Homer and the Epic Cycle". The recent upsurge is due in no small part to the publication of three new editions of the fragmentary Greek epics, including a translation by West for the Loeb Classical Library series.