Stall, John Byron; Gottschalk, L.C.; Klingebiel, Albert A.; Sauer, E.L.; Melsted, S.W.(Illinois State Water Survey, 1951)
Studies with two 3-cm radars and dense surface hail networks showed that the
areal extent of hail during a given precipitation period can be estimated in a study area
from the areal extent of the highest half-order ...