Salgado et al. (1997) defined Neosauropoda on the basis of maximally-inclusive specifiers rather than species. Wilson and Sereno (1998) and Sereno (1998) used genera. All are pointing to the same node-based clade. The active definiton is a first-order revision of that in Salgado et al. (1997).
Note that Upchurch (1998:84) attributed authorship of Neosauropoda to Upchurch (1995); the taxon, however, was coined nearly a decade earlier by Bonaparte (1986).