Search for: [Abstract = "The paper presents three\- and four\-stage implicit interval methods of Runge\-Kutta type and is a continuation of our previous paper \[6\] dealing with one\- and two\-stage methods of this kind. It is shown that the exact solution of the initial value problem belongs to interval\-solutions obtained by both kinds of these methods \(three\- and four\-stage\). We also present some approximations of the widths of interval\-solutions."]
