Zastavnyi, Victor P. - In: Journal of Multivariate Analysis 73 (2000) 1, pp. 55-81
Let [rho] be a nonnegative homogeneous function on n. General structure of the set of numerical pairs ([delta], [lambda]), for which the function (1-[rho][lambda](x))[delta]+ is positive definite on n is investigated; a criterion for positive definiteness of this function is given in terms of...