[471] Extensions of Wielandt’s Min-max Principles for Positive Semi-Definite Pencils

[472] Escaping geodesics of Riemannian surfaces

[473] On the solvability of the diophantine equation$ax$^{2}+$by$^{2}+$cz$^{2}=0 in imaginary Euclidean quadratic fields

[474] The laplacian for domains in hyperbolic space and limit sets of Kleinian groups

[475] The inhomogeneous minima of binary quadratic forms (III)