Lie theory and its applications in physics 6 : proceedings of the 6 international workshop, Varna, Bulgaria, 15-21 August 2005 : 4-th international symposium "quantum theory and symmetries" : QTS-4 : 4 international symposium "quantum theory and symmetries" : Aug 2005, Varna, Bulgaria. (Bulgarian Journal of Physics ; 33. Supplement ; 2) (Heron Press Science Series)
Lie theory and its applications in physics 6 : proceedings of the 6 international workshop, Varna, Bulgaria, 15-21 August 2005 : 4-th international symposium "quantum theory and symmetries" : QTS-4 : 4 international symposium "quantum theory and symmetries" : Aug 2005, Varna, Bulgaria.