  In this paper, we discover that any univariate Niho bent function is a sum of
functions having the form of Leander-Kholosha bent functions with extra
coefficients of the power terms. This allows immediately, knowing the terms of
an o-polynomial, to obtain the powers of the additive terms in the polynomial
representing corresponding bent function. However, the coefficients are
calculated ambiguously. The explicit form is given for the bent functions
obtained from quadratic and cubic o-polynomials. We also calculate the
algebraic degree of any bent function in the Leander-Kholosha class.
