Cones in tensor products of ordered Banach spaces. Khudalov, V.T. — 1999 Vladikavkazskiĭ Matematicheskiĭ Zhurnal
Description of all regular cones in a Hilbert space. Khudalov, V.T. — 2001 Siberian Mathematical Journal
The distance from a point to a cone in a Hilbert space. Khudalov, V.T. — 1999 Vladikavkazskiĭ Matematicheskiĭ Zhurnal