Practical quantum mechanics. Reprint of the 1994 edition. - Springer Verlag, 1999. - (Classics in Mathematics).
Perturbation theory for linear operators. Corrected printing of the second edition. - Springer Verlag, 1995. - (Classics in Mathematics).
Functional analysis. Sixth edition. - Springer Verlag, 1995. - (Classics in Mathematics).
Transformation groups in differential geometry. - Springer Verlag, 1972. - (Classics in Mathematics).
Finite geometries. - Springer Verlag, 1968. - (Classics in Mathematics).