BibSlavKon: 3 hits for Lekov, I.

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 Lekov, I. provides 3 hits
1	Kompensacijata - razvoen faktor v slavjanskite ezikovi sistemi Lekov, I. - Slavjanska filologija (1973), 17-26
2	Charakter na diskusionnite văprosi v sravnitelnata gramatika na slavjanskite ezici Lekov, I. - Slavjanska filologija : materiali za V Meždunaroden kongres na slavistite (1963), 35-50
3	Značenieto na gramatičeskite, slovoobrazovatelni i leksikalni danni za klasifikacijata na slavjanskite ezici ot săvremeno gledište Lekov, I. - Slavjanskaja filologija : sbornik statej (1958), 64-78

Bibliography of International Congresses of Slavists (BibSlavKon)

Kompensacijata - razvoen faktor v slavjanskite ezikovi sistemi

Charakter na diskusionnite văprosi v sravnitelnata gramatika na slavjanskite ezici

Značenieto na gramatičeskite, slovoobrazovatelni i leksikalni danni za klasifikacijata na slavjanskite ezici ot săvremeno gledište