TY - RPRT TI - Supporting user-defined granularities in a spatiotemporal conceptual model AU - V. Khatri AU - S. Ram AU - R.T. Snodgrass AU - G. M. O’Brien PY - 2002 DO - 10.1023/a:1015868307494 UR - https://pubs.usgs.gov/publication/70023843 ID - 70023843 ER -