@article{ tucker1979, author = {Tucker, C. J. and Elgin Jr, J. H. and McMurtrey Iii, J. E. and Fan, C. J.}, title = {Monitoring corn and soybean crop development with hand-held radiometer spectral data}, journal = {Remote Sensing of Environment}, publisher = {}, pages = {237-248}, volume = {8}, number = {3}, year = {1979} } @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} }