Note on the quadratic Gauss sums. Danas, George — 2001 International Journal of Mathematics and Mathematical Sciences
Crossed modules, Crossed n-fold extension of groups and Cohomology theory in Abstract Categories George Danas — 1999 Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
The Obstruction theory of Group Extensions and H^3(Q, A) in Abstract Categories George Danas — 1999 Δελτίο της Ελληνικής Μαθηματικής Εταιρίας