Here, a and b are real parameters. One could also consider the form of the right-hand side ... y +aÿ+bẏ+ cy but simple scalings allow to reduce to the case c = 1. These equations describe a… (More)

Abnormal Papanicolaou smears has increased in adolescents. Our objective was to analyze the frequency of cervical intraepithelial neoplasia (CIN) in adolescents (<20 years of age) over the last 12… (More)

We propose an analytical representation of close-to-equilibrium solutions of nonlinear conservative oscillators with n-degrees of freedom (n ≥ 2) using semitrigonometric polynomials, given in closed… (More)

A matrix A is called (positive) D-stable if DA is positive stable, i.e. all eigenvalues have strictly positive real parts, for all positive diagonal matrices D. The concept of D-stability of a matrix… (More)