Repositorio Institucional de la Universidad de Oviedo

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The authors want to thank the advices and help of José Pedro Sancho Martínez during the research. We could not forget the valuable information provided by María Teresa Suárez Rodríguez. We thank Juan Carlos Sánchez Recio and Alberto Fuentes for their cooperation during the research. Finally, we want to thank Janusz Prazuch of the AGH University for his help during the research. The research was also supported by the Spanish Ministry of Education, Culture, and Sports via an FPU (Formación del Profesorado Universitario) grant to Daniel Fernández González (FPU014/02436).