The nitrogen cycle: A review of isotope effects and isotope modeling approaches
Tobias R.A. Denk, Joachim Mohn, Charlotte Decock, Dominika Lewicka-Szczebak, Eliza Harris, Klaus Butterbach-Bahl, Ralf Kiese, Benjamin Wolf
Soil Biology and Biochemistry
http://www.sciencedirect.com/science/article/pii/S0038071716305946
A very, very useful review to read !
