To cite package 'stoichcalc' in publications use:

Reichert P, Schuwirth N (2010). “A generic framework for deriving process stoichiometry in environmental models.” Environmental Modelling and Software, 25(10), 1241–1251. doi:10.1016/j.envsoft.2010.03.002.

Corresponding BibTeX entry:

  @Article{,
    title = {A generic framework for deriving process stoichiometry in
      environmental models},
    author = {Peter Reichert and Nele Schuwirth},
    journal = {Environmental Modelling and Software},
    volume = {25},
    number = {10},
    pages = {1241--1251},
    year = {2010},
    doi = {10.1016/j.envsoft.2010.03.002},
    keywords = {Stoichiometric matrix, Stoichiometric coefficient,
      Stoichiometric calculations, Ecological model, Environmental
      model, Biological stoichiometry, Simulation software},
  }