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-#' Single First-Order kinetics
-#'
-#' Function describing exponential decline from a defined starting value.
-#'
-#' @param t Time.
-#' @param parent.0 Starting value for the response variable at time zero.
-#' @param k Kinetic constant.
-#' @return The value of the response variable at time \code{t}.
-#' @references FOCUS (2006) \dQuote{Guidance Document on Estimating Persistence
-#' and Degradation Kinetics from Environmental Fate Studies on Pesticides in
-#' EU Registration} Report of the FOCUS Work Group on Degradation Kinetics,
-#' EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
-#' \url{http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics}
-#' @examples
-#'
-#' \dontrun{plot(function(x) SFO.solution(x, 100, 3), 0, 2)}
-#'
-#' @export
-SFO.solution <- function(t, parent.0, k)
-{
- parent = parent.0 * exp(-k * t)
-}

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