Vous trouverez ci-dessous des études glânées sur le Web ...

https://drive.google.com/file/d/0B98WpHrvGVv5aTRfX3dTR0Qxb0E/view?usp=sharing

https://drive.google.com/file/d/0B98WpHrvGVv5Rnk2YUZScTNUckk/view?usp=sharing

https://drive.google.com/file/d/0B98WpHrvGVv5SHRLT0NHRGlEWWM/view?usp=sharing

https://drive.google.com/file/d/0B98WpHrvGVv5QS02V1l1djlZRUk/view?usp=sharing