1Both authors acknowledge with thanks the support of the Junta Nacional de Investigacao Cientifica e Tecnologica (JNICT), the Fundagao Caloiiste Gulbenkian and the Projecto Praxis XXI.
Notes
1Both authors acknowledge with thanks the support of the Junta Nacional de Investigacao Cientifica e Tecnologica (JNICT), the Fundagao Caloiiste Gulbenkian and the Projecto Praxis XXI.