Spiegel, H., Filcheva, E., Hegymegi, P., Gal, A., Verheijen, F. Review and comparison of methods used for soil organoc carbon determination. Part 1. Review of the methods. Sofia: 2008 с. pg. 9-22,.
Spiegel, H., Filcheva, E., Hegymegi, P., Gal, A., Verheijen, F. Review and comparison of methods used for soil organoc carbon determination. Part 1. Review of the methods. Sofia: 2008 с. pg. 9-22,.
Spiegel, H., Filcheva, E., Hegymegi, P., Gal, A., Verheijen, F. (2008) Review and comparison of methods used for soil organoc carbon determination. Part 1. Review of the methods, Sofia: с. pg. 9-22,.
Spiegel, H., Filcheva, E., Hegymegi, P., Gal, A., & Verheijen, F. (2008). Review and comparison of methods used for soil organoc carbon determination. Part 1. Review of the methods. Sofia: с. pg. 9-22.
Spiegel H, Filcheva E, Hegymegi P, Gal A, Verheijen F. Review and comparison of methods used for soil organoc carbon determination. Part 1. Review of the methods. Sofia: 2008. p. с. pg. 9-22.