BibSlavKon: 3 hits for Rudnyc'kyj, Ja.

The Bibliography of International Congresses of Slavists (1929-2018) was converted from thirteen printed volumes into a database in cooperation with the Slavonic Library in Prague (Slovanská knihovna Praha) and contains 8550 records. Since 2008 the Bibliography appear only in electronic form and will be updated in five-year interval according to the next Congresses of Slavists. The further information can be found here. The overview of the classification can be found: here.

Your search for Rudnyc'kyj, Ja. provides 3 hits
1	Funkciji narostkiv -yšče, -ys’ko v ukrajins’kij movi, jak pryčynok do henezy cych narostkiv na slov. hrunti Rudnyc'kyj, Ja. - Księga referatów : II Międzynarodowy zjazd slawistów (filologów słowiańskich). Sekcja I – Językoznawstwo = Recueil des communications : II Congrès international des slavistes (philologues slaves). Section I – Linguistique (1934), 96-99
2	U spravi deverbatyviv iz narostkamy -yšče, -ys’ko u slov’jans’kych movach Rudnyc'kyj, Ja. - Zapysky Naukovoho tovarystva imeny Ševčenka. Praci filolohičnoji sekciji (1937), 217-222
3	Narostky -yšče, -ys’ko, -s’ko v ukrajins’kij movi Rudnyc'kyj, Ja. - 1935, 63 s.

Bibliography of International Congresses of Slavists (BibSlavKon)

Funkciji narostkiv -yšče, -ys’ko v ukrajins’kij movi, jak pryčynok do henezy cych narostkiv na slov. hrunti

U spravi deverbatyviv iz narostkamy -yšče, -ys’ko u slov’jans’kych movach

Narostky -yšče, -ys’ko, -s’ko v ukrajins’kij movi