To cite visa in publications use:

Yu K, Lenz-Wiedemann V, Chen X, Bareth G (2014). “Estimating leaf chlorophyll of barley at different growth stages using spectral indices to reduce soil background and canopy structure effects.” ISPRS Journal of Photogrammetry and Remote Sensing, 97, 58–77. doi:10.1016/j.isprsjprs.2014.08.005.

Corresponding BibTeX entry:

  @Article{,
    title = {Estimating leaf chlorophyll of barley at different growth
      stages using spectral indices to reduce soil background and
      canopy structure effects},
    author = {Kang Yu and Victoria Lenz-Wiedemann and Xinping Chen and
      Georg Bareth},
    journal = {ISPRS Journal of Photogrammetry and Remote Sensing},
    year = {2014},
    volume = {97},
    pages = {58--77},
    doi = {10.1016/j.isprsjprs.2014.08.005},
  }