Ptashnyk, B. Yo.     Local multipoint problems for evolutional equations [Текст] / B.Yo. Ptashnyk // Spectral theory and differential equations : intern. conf. in honor of V. A. Marchenko's 90th birthday, Aug. 20-24, 2012, Kharkiv, Ukraine / B. Verkin Inst. for Low Temperature Physics and Engineering of the Nat. Acad. of Sciences of Ukraine, V. Karazin Kharkiv Nat. Univ. — Kharkiv, 2012. — P. 88.