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Crofton's formulas in the theory of line congruences in the Euclidean space E^n
On some boundary problems for the equation Uxx + sign Y Uyy = 0. II
On certain boundary problems for the equation Uxx + sign Y Uyy = 0. I
Einführung von ∑f(x) und ∏f(x) in der rekursiven Gitterpunktarithmetik
On the (n+1)-webs of multidimensional surfaces
Известия на Математическия институт
Bulletin de l'Institut de Mathématiques
From 1975 the journal comes out under the name Serdica Bulgariacae Mathematicae Publicationes