1. Singular Potentials and Resonances;Arsenʼev,1974
2. Bender–Wu formulas for the Zeeman effect in hydrogen;Avron;Ann. Phys.,1981
3. Estimates for the number of negative eigenvalues of the Schrödinger operator and its generalisations;Birman,1991
4. The negative discrete spectrum of the operator (−Δ)m−αV in L2(Rd) for d even and 2m⩾d;Birman;Ark. Mat.,1997
5. A remark on two dimensional periodic potentials;Dahlberg;Comment. Math. Helv.,1982