References: Time derivative & Upwind Method
Smith, G. D.
Hughes, T. J.
 A Simple Scheme for Developing Upwind Finite Element, Int. J. Num. Meth., Eng., Vol. 12, pp.13591365, 1978
Christie, I., Griffits, D. F., A. R. Mitchell and O. C. Zienkiewicz
 Finite Element Methods for Second Order Equation with Significant First Derivatines, Int. J. Num. Eng. Vol. 10, pp.13891396, 1976



Fukumori, E.
 Finite Element Method applied to a onedimensional convectiondiffusion problem, Rep. Dep. Civil Eng. Mechanics, Univ. WisconsinMilwaukee, 1987.
Fukumori, E. and Erik R. Christensen
 Modeling inverse problem of particleassociated pollutants in lake sediment using the time domain method, Rep. Dep. Civil Eng. Mechanics, Univ. WisconsinMilwaukee, 1988.
Christensen, E. R., Eiji Fukumori
 Notes on deconvolution of sedimentary records in the time domain, Rep. Dep. Civil Eng. Mechanics, Univ. WisconsinMilwaukee, 1987.
Fukumori, E. and Erik R. Christensen
 "A model for ^{137}Cs and other tracers in lake sediments considering particle size and the inverse solution," Earth and Planetary Science Letters, Vol. 114, pp. 8599, Elsevier Science Publishers B. V., Amsterdam, 1992.