Here's a few, some are old, some are new.
This is one that I read about Ca and blue light.
Another with red light:
This is about the best on line public article:
Calcium in Plants -- WHITE and BROADLEY 92 (4): 487 -- Annals of Botany
If you need more Calcium ref's check the ref section for the White paper above. That should keep you out of trouble for a month or more.
Barber, S. 1995 Soil Nutrient Bioavailability: A Mechanistic Approach
2nd ed. Wiley, John & Sons, Inc.
Edited by L. A. Desougi. H.J. Dumont Edited by A. I. Moghraby 1984.
Dobermann A, Fairhurst T. 2000. Rice. Nutrient disorders & nutrient management. Handbook series. Potash & Phosphate Institute (PPI), Potash & Phosphate Institute of Canada (PPIC) and International Rice Research Institute. 191 p.
Esau, K 1977, Plant Anatomy. 576 pages 2nd Edition edition John Wiley & Sons Canada, Ltd
FINK, S. 1991. Comparative microscopical studies on the patterns of calcium oxalate distribution in the needles of various conifer species. Bot. Acta 104: 306-315.
Franceschi V. R. and Nakata, P. A. 2005. 2005 CALCIUM OXALATE IN PLANTS: Formation and Function Annual Review of Plant Biology Vol. 56: 41-71 June.
Johnson, J. Substrates for the planted aquarium. 2000. Substrates for the Planted Aquarium
Kauss H., Some Aspects of Calcium-Dependent Regulation in Plant Metabolism
Annual Review of Plant Physiology, June 1987, Vol. 38, Pages 47-71
Marschner, H. 1995, 1986. Mineral Nutrition of Higher Plants. Academic Press, London.
OKALI, D.U.U. and ATTIONU, R.H. 1974. The quantities of some nutrient elements in Pistia stratiotes
L. from the Volta Lake. Ghana Jnl Agric. Sci. 7: 203-208.
Oki. Ito, M. and Ueki, K. 1978. Studies on the growth and reproduction of water hyacinth, Eichhornia crassipes
(Mart.) Solms. 1. Effect of nutrients on the growth and reproduction. Weed res., Tokyo 23: 115-120.
SINGH, H.D., NAG, B.,SARMA, A.K., and BARUAH, J.N. 1984. Nutrient control of water hyacinth growth and productivity. In G. Thyagarajan (Ed) Proc. Int. Conf. Water Hyacinth. UNEP, Nairobi p243-263.
SUTCLIFFE, J.E. and BAKER, D.A., 1974. Plants and Mineral salts. Edward and Arnold, London.
Talatala, R.L. 1974. Some aspects of the growth and reproduction of water hyacinth Eichhornia crassipes
(Mart.) Solms. Southeast Asian Workshop on aquatic Weeds, Malang, June 1974. mss. 27pp
Tamura S., Kuramochi H. and Ishizawa K. Involvement of Calcium Ion in the Stimulated Shoot Elongation of Arrowhead Tubers under Anaerobic Conditions Plant and Cell Physiology, 2001, Vol. 42, No. 7 717-722
WYN JONES, R.G. and LUNT, O.R. 1967. The function of calcium in plants. Bot. Rev. 33: 407-426.
Zipkin, Isadore, 1973. Biological Mineralization, John Wiley & Sons, NY.
Too much focus on specifics and micromangement and you can miss the larger whole plant response and regulation balance. I seldom suggest micromangement methods, rather, go after things as a whole and rule things out the best you can, but do not rely so heavily on test kits unless you can calibrate them or can estimate using EI or something similar to ensure your assumptions are correct. Then go back and make sure a few times more.