Transmission Eigenvalues for Operators with Constant Coefficients. - Michael Hitrik; Katsiaryna Krupchyk; Petri Ola; Lassi Päivärinta (SIAM J. Math. Anal., 2010)

Transmission Eigenvalues for Elliptic Operators. - Michael Hitrik; Katsiaryna Krupchyk; Petri Ola; Lassi Päivärinta (SIAM J. Math. Anal., 2011)