Key points are not available for this paper at this time.
Martin R. McAinsh, Alex A. R. Webb, Jane E. Taylor, Alistair M. Hetherington, Stimulus-Induced Oscillations in Guard Cell Cytosolic Free Calcium, The Plant Cell, Vol. 7, No. 8 (Aug., 1995), pp. 1207-1219
McAinsh et al. (1995) studied this question.