@article{TUW-197121, author = {Garcia-Barrientos, Abel and Palankovski, Vassil}, title = {{N}umerical {S}imulations of {S}pace {C}harge {W}aves in {I}n{P} {F}ilms and {M}icrowave {F}requency {C}onversion under {N}egative {D}ifferential {C}onductivity}, journal = {{A}pplied {P}hysics {L}etters}, year = {2011}, volume = {98}, pages = {072110-1--072110-3}, url = {http://www.iue.tuwien.ac.at/pdf/ib_2010/JB2011_Garcia_1.pdf}, doi = {10.1063/1.3555467} }