Some Observations of the lamellar Morphology in Isotactic Polypropylene Spherulites by SFM G. Castelein, G. Coulon, M. Aboulfaraj, C. G'Sell and E. Lepleux J. Phys. III France, 5 5 (1995) 547-555 DOI: 10.1051/jp3:1995145