Authors: Ivan Ginchev and Juan-Enrique Martínez-Legaz
Nonlinear Analysis: Theory, Methods & Applications, Vol. 74, No 17, 6781--6787, January, 2011Authors: Ivan Ginchev and Juan-Enrique Martínez-Legaz
Nonlinear Analysis: Theory, Methods & Applications, Vol. 74, No 17, 6781--6787, January, 2011© Barcelona Graduate School of Economics. All rights reserved.