Bibliography of International Congresses of Slavists (BibSlavKon)

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 S8463 provides 2 hits
1	The Loss of the Imperfective Aorist in Macedonian : Structural Significance and Balkan Context Friedman, Victor A. - American Contributions to the Eleventh International Congress of Slavists : Bratislava, August - September 1993 : Literature : Linguistics : Poetics (1993), 285-302
2	Fragments of a Serbian Apostolos in Budapest and Their Significance for Textual Criticism Cleminson, Ralph - Palaeobulgarica = Starobălgaristika 30 (2006) 4, 3–34

Bibliography of International Congresses of Slavists (BibSlavKon)

The Loss of the Imperfective Aorist in Macedonian : Structural Significance and Balkan Context

Fragments of a Serbian Apostolos in Budapest and Their Significance for Textual Criticism