1. Signal and Image Processing Center, Universidad Tecnológica Nacional, Ciudad Autónoma de Buenos Aires C1179AAQ, Argentina
2. School of Mathematics and Statistics, Victoria University of Wellington, Wellington 6140, New Zealand
3. Department of Mathematics, FaCENA, Universidad Nacional del Nordeste and CONICET, Corrientes W3400AYY, Argentina
4. CIDIA, Universidad Nacional de Hurlingham, Pcia. de Buenos Aires Argentina—CPSI Universidad Tecnológica Nacional, Buenos Aires C1041AAJ, Argentina
5. Departamento de Ciência da Computação, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil