1. Merriam, D. F., and Robinson, J. E., 1970, Trend analysis in geologic and geophysical exploration,in Symposium on mathematical methods in geology and geophysics: Hormicka Priram ve vede a Technice, 41 p.
2. Robinson, J. E., Charlesworth, H. A. K., and Kanasewich, E. T., 1968, Spatial filtering of structural contour maps: Proc. 23rd Intern. Geol. Cong. (Prague) Sect. 13, p. 163–173.
3. Robinson, J. E., Charlesworth, H. A. K., and Ellis, M. J., 1969, Structural analysis using spatial filtering in interior plains of south-central Alberta: Am. Assoc. Petroleum Geology, Bull., v. 53, no. 11, p. 2341–2367.
4. Robinson, J. E., and Charlesworth, H. A. K., 1969, Spatial filtering illustrates relationship between tectonic structure and oil occurrences in southern and central Alberta: Kansas Geol. Survey Computer Control, 40, p. 13–18.
5. Robinson, J. E., and Ellis, M. J., 1971, Spatial filters and FORTRAN IV program for filtering geologic maps: Geosystems, Geocom Programs 1. (London), 21 p.