Despite having put the utmost care in drafting this work, the author or publisher cannot in any way be held responsible for information (formulas, recipes, techniques, etc.) expressed in the text. It is advisable, in the case of specific problems - often unique - to each reader in particular, to consult a qualified person to obtain the most accurate, complete and most up-to-date information possible. EDITORIAL DE VECCHI, U. S. A.

The publisher thanks Béhel for his collaboration.

© Editorial De Vecchi, S. A. 2016

© [2016] Confidential Concepts International Ltd., Ireland