BibSlavKon: 33 hits for L5640 on page 1

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 L5640 provides 33 hits
1	La langue bulgare et la transition politique ou la langue en transition 1989–2013 Armianov, Gueorgui - Revue des études slaves 84 (2013) 1/2, 25–41
2	Histoire de la langue macédonienne Pejoska-Bouchereau, Frosa - Revue des études slaves 79 (2008) 1/2, 145–161
3	La notion de langue littéraire chez les Slaves Unbegaun, B. O. - Revue des études slaves 42 (1963) 1/4, 149-150
4	Il futuro nelle lingue slave fra tempo e modo Fici Giusti, Francesca - Contributi italiani al XII Congresso internazionale degli slavisti : (Cracovia 26 Agosto - 3 Settembre 1998) (1998), 245-269
5	Lingua e ortodossia nel pensiero di Matteo Karaman Lomagistro, Barbara - Contributi italiani al XII Congresso internazionale degli slavisti : (Cracovia 26 Agosto - 3 Settembre 1998) (1998), 419-463
6	Living Conservation of the Lexis of Old Church Slavonic Ribarova, Zdenka; Ribarov, Kiril - Palaeobulgarica = Starobălgaristika 22 (1998) 2, 97-103
7	Relazioni anaforiche tra lingue con e senza articolo Giusti Fici, F. - Mondo slavo e cultura italiana : contributi italiani al IX Congresso Internazionale degli Slavisti Kiev 1983 (1983), 153-161
8	Les problèmes des éléments hongrois de la langue tchèque Sulán, B. - Studia slavica Academiae scientiarum hungaricae 9 (1963) 1/4, 9-26
9	Récitation collective dans ľenseignement de la langue maternelle Stojiljković, N. D. - Saopštenja i referati : III međunarodni kongres slavista (slovenskih filologa) : 18.–25.IX.1939 = Communications et rapports : IIIème congrès international des slavistes (philologues slaves) (1939), 182-184
10	La linguistique, le discours sur la langue et ľespace géoanthropologique russe Sériot, Patrick - Schweizerische Beiträge zum XII. Internationalen Slavistenkongress in Krakau, August 1998 (1998), 363-395

Bibliography of International Congresses of Slavists (BibSlavKon)