@article{ buschmann1993, author = {Buschmann, Claus}, title = {Fernerkundung von Pflanzen - Ausbreitung, Gesundheitszustand und Produktivitfit}, journal = {Naturwissenschaften}, publisher = {}, pages = {439-453}, volume = {80}, number = {}, year = {1993} } @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} }