To cite package 'deSolve' in publications use:

Karline Soetaert, Thomas Petzoldt, R. Woodrow Setzer (2010). Solving Differential Equations in R: Package deSolve Journal of Statistical Software, 33(9), 1--25. URL http://www.jstatsoft.org/v33/i09/.

Corresponding BibTeX entry:

  @Article{,
    title = {Solving Differential Equations in R: Package deSolve},
    author = {Karline Soetaert and Thomas Petzoldt and R. Woodrow
      Setzer},
    journal = {Journal of Statistical Software},
    volume = {33},
    number = {9},
    pages = {1--25},
    year = {2010},
    coden = {JSSOBK},
    issn = {1548-7660},
    url = {http://www.jstatsoft.org/v33/i09},
    keywords = {ordinary differential equations, partial differential
      equations, differential algebraic equations, initial value
      problems, R, FORTRAN, C},
  }