@phdthesis{TUW-111635, author = {M{\"a}nner, Oswald}, title = {{K}notenvariablen-{A}nalyse von {O}berfl{\"a}chenwellenfiltern}, school = {{I}nstitut f{\"u}r {A}llgemeine {E}lektrotechnik und {E}lektronik}, year = {1987} }