BibSlavKon: 13 hits for P1575 on page 2

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 P1575 provides 13 hits
11	Observations sur la troisième personne du pluriel du présent et sur le participe présent actif en bulgare moderne Bernard, Roger - Communications de la délégation française et de la délégation suisse : VIe Congrès international des slavistes : Prague, 7-13 août 1968 (1968), 7-16
12	Der Nominativus Pluralis der Nomina in der polnischen und russischen Gegenwartssprache : ein Beitrag zur Morphonologie der Flexion in den slavischen Sprachen Pohl, A. - Slavistische Studien zum IX. Internationalen Slavistenkongress in Kiev 1983 (1983), 361-386
13	The Plurality Feature as a Lexical Semantic Feature of Four Russian Spatial Adjectives and as a Subclassifier of Parts of Speech in the Definite Article in Slavic Schooneveld, Cornelis Hendrik - American Contributions to the Twelfth International Congress of Slavists : Cracow, August - September 1998 : Literature, Linguistics, Poetics (1998), 555-562

Bibliography of International Congresses of Slavists (BibSlavKon)

Observations sur la troisième personne du pluriel du présent et sur le participe présent actif en bulgare moderne

Der Nominativus Pluralis der Nomina in der polnischen und russischen Gegenwartssprache : ein Beitrag zur Morphonologie der Flexion in den slavischen Sprachen

The Plurality Feature as a Lexical Semantic Feature of Four Russian Spatial Adjectives and as a Subclassifier of Parts of Speech in the Definite Article in Slavic