@article{ main2011, author = {Main, Russell and Cho, Moses Azong and Mathieu, Renaud and O’Kennedy, Martha M. and Ramoelo, Abel and Koch, Susan}, title = {An investigation into robust spectral indices for leaf chlorophyll estimation}, journal = {ISPRS Journal of Photogrammetry and Remote Sensing}, publisher = {}, pages = {751-761}, volume = {66}, number = {6}, year = {2011} } @misc{ idb, author = {Henrich, V. and Krauss, G. and Götze, C. and Sandow, C.}, title = {The IndexDatabase}, publisher = {}, address = {Bonn}, pages = {}, volume = {}, number = {}, year = {2011} }