1. Institute of Mechanics, 264 Doi Can, VAST 18 Hoang Quoc Viet , University of Engineering and Technology , VNU, 144 Xuan Thuy , Hanoï , Vietnam
2. Marchuk Institute of Numerical Mathematics , Russian Academy of Sciences , 119333 Gubkina 8 , Moscow , Russia
3. Torus actions , 3 Avenue Didier Daurat, 31400 , Toulouse , France
4. Institute of Mechanics, 264 Doi Can, VAST 18 Hoang Quoc Viet , College of Engineering , Swansea University , Swansea , UK