The L omega1, omega1 -Theory of Hilbert Spaces. - Ralph Kopperman (J. Symb. Log., 1967)

First-Order Topological Axioms. - Ralph Kopperman (J. Symb. Log., 1981)

A Jordan Surface Theorem for Three-Dimensional Digital Spaces. - Ralph Kopperman; Paul R. Meyer; Richard G. Wilson (Discret. Comput. Geom., 1991)

The Asymmetric Topology of Computer Science. - Ralph Kopperman; Bob Flagg (MFPS, 1993)

Fixed points and reflexive domain equations in categories of continuity spaces. - Bob Flagg; Ralph Kopperman (MFPS, 1995)

Dimensional properties of graphs and digital spaces. - Alexander V. Evako; Ralph Kopperman; Yurii V. Mukhin (J. Math. Imaging Vis., 1996)

Computational models for ultrametric spaces. - Bob Flagg; Ralph Kopperman (MFPS, 1997)

Continuity Spaces: Reconciling Domains and Metric Spaces. - Bob Flagg; Ralph Kopperman (Theor. Comput. Sci., 1997)

Characterizing Topologies With Bounded Complete Computational Models. - Krzysztof Ciesielski; Bob Flagg; Ralph Kopperman (MFPS, 1999)

The other topology. - Ralph Kopperman (MFCSIT, 2000)

Topological Digital Topology. - Ralph Kopperman (DGCI, 2003)

Jordan Surfaces in Discrete Antimatroid Topologies. - Ralph Kopperman; John L. Pfaltz (IWCIA, 2004)

Philosophical Issues in Computer Science. - Ralph Kopperman; Steve Matthews; Homeira Pajoohesh (WSPI, 2004)

Auxiliary relations and sandwich theorems. - Chris Good; Achim Jung; Robin W. Knight; Ralph Kopperman (Spatial Representation, 2005)

What do partial metrics represent? - Ralph Kopperman; Steve Matthews; Homeira Pajoohesh (Spatial Representation, 2005)

04351 Summary - Spatial Representation: Discrete vs. Continuous Computational Models. - Ralph Kopperman; Prakash Panangaden; Michael B. Smyth; Dieter Spreen; Julian Webster (Spatial Representation, 2005)

04351 Abstracts Collection - Spatial Representation: Discrete vs. Continuous Computational Models. - Ralph Kopperman; Prakash Panangaden; Michael B. Smyth; Dieter Spreen; Julian Webster (Spatial Representation, 2005)

On storage of topological information. - Ralph Kopperman (Discret. Appl. Math., 2005)

06341 Abstracts Collection – Computational Structures for Modelling Space, Time and Causality. - Ralph Kopperman; Prakash Panangaden; Michael B. Smyth; Dieter Spreen (Computational Structures for Modelling Space, Time and Causality, 2006)

Foreword. - Ralph Kopperman; Prakash Panangaden; Michael B. Smyth; Dieter Spreen; Julian Webster (Theor. Comput. Sci., 2006)

Foreword. - Ralph Kopperman; Prakash Panangaden; Michael B. Smyth; Dieter Spreen (Theor. Comput. Sci., 2008)

Partial Metric Spaces. - Michael A. Bukatin; Ralph Kopperman; Steve Matthews; Homeira Pajoohesh (Am. Math. Mon., 2009)

Some corollaries of the correspondence between partial metrics and multivalued equalities. - Michael A. Bukatin; Ralph Kopperman; Steve Matthews (Fuzzy Sets Syst., 2014)