On certain Conjectures on invariant measures on semigroups. A. Mukherjea, N.A. Tserpes (1970) Semigroup forum
On Differential Equations in lie Algebroids Apostolos N. Nikolopoulos (2000) Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
On Functions of Positive Type on Commutative Monoids. Walter Schempp (1977) Mathematische Zeitschrift
On α -level topological groups. Salih, Haval Mahmood Mahamad, Borumand Saeid, Arsham (2009) Acta Universitatis Apulensis. Mathematics - Informatics