In order to be healthy, people need essential amino acids, carbohydrates, essential fatty acids and not less than 28 vitamins and minerals. The fish is a healthy protein source with a special nutritional value, rich in essential nutrients: proteins, amino acids, vitamins A, B6, B12, D, and...

The construction of formal models that deal with space observed a huge increase since the late 1980s. As Fujita et al. (1999) stress, the field of regional economics experienced a revival with the emergence of new analytical tools such as the diffusion of imperfect competition models, networks...