The Singular Spectrum of Elliptic Differential Operators in Lp (Rn). Erik Balslev — 1966 Mathematica Scandinavica
Discreteness of the Spectrum of a Second Order Elliptic Differential Operator in L2 (rn). Erik Balslev — 1968 Mathematica Scandinavica
Analytic scattering theory of quantum mechanical three-body systems Erik Balslev — 1980 Annales de l'I.H.P. Physique théorique
Resonance functions of two-body Schrödinger operators Erik Balslev; Erik Skibsted — 1988 Journées équations aux dérivées partielles
Asymptotic and analytic properties of resonance functions Erik Balslev; Erik Skibsted — 1990 Annales de l'I.H.P. Physique théorique
Boundedness of two- and three-body resonances Erik Balslev; Erik Skibsted — 1985 Annales de l'I.H.P. Physique théorique