Литвиненко, О., М. Стоколос, and О. Якубенко. “The Analysis of Pulse Waves of Own Vectors of the Operator of Differentiation in Basis of Transformations Wolsha-Hadamara”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 34, June 2007, pp. 33-36, doi:10.20535/RADAP.2007.34.33-36.