H. Hadwiger

On Polyhedra with Extremal Euler Characteristic

P. Mani, H. Hadwiger, 1974, J. Comb. Theory, Ser. A.

Hyperrhombs inscribed to concex bodies

David G. Larman, P. Mani, H. Hadwiger, 1978, J. Comb. Theory, Ser. B.

On the Euler characteristic of spherical polyhedra and the Euler relation

H. Hadwiger, P. Mani, 1972 .