@Article{EF+02,
    Author       = "Ernst, Z. and Fitelson, B. and Harris, K. and Wos, L.",
    Year         = "2002",
    Title        = "{Shortest Axiomatizations of Implicational $S4$ and $S5$}",
    Journal      = "Notre Dame Journal of Formal Logic",
    Volume       = "43",
    Number       = "3",
    Pages        = "169-179",
    Comment      = ""
}

% Other possible matches are:

@InProceedings{EF+02-PPSA,
    Author       = "Ernst, Z. and Fitelson, B. and Harris, K. and McCune, W.
                    and Padmanabhan, R. and Veroff, R. and Wos, L.",
    Year         = "2002",
    Title        = "{More First-order Test Problems in Math and Logic}",
    Editor       = "Sutcliffe, G. and Pelletier, J. and Suttner, C.",
    BookTitle    = "{Proceedings of the CADE-18 Workshop - Problem and Problem
                    Sets for ATP}",
    Place        = "Copenhagen, Denmark",
    Series       = "Department of Computer Science, University of Copenhagen,
                    Technical Report",
    Number       = "02/10",
    Pages        = "",
    Comment      = "TPTPRef"
}