KARIEL VASELENAK: WAVES OF SPATIAL DIFFUSION If one accepts the above explanation of including a zero point, then distance and time are symmetrical and substitutable in waves of diffusion. In addition to obtaining a closer fit to the data, a more realistic view of the diffusion process is studying waves of spatial diffusion possible to incorporate the concept of energy when REFERENCES 1] Morrell, R. L " Waves of Spatial Diffusion, "Journal of Regional Science, 8(1968), 1-18 The Shape of Diffusion in Space and Time, "Economic Geography, 46(1970), 259- 3] Resnick, R and D. Halliday. Physics. New York: Wiley, 1966