The natural weathering of composite materials subjected to torsional stress /
Longchal, M.
Garston :  Building Research Station, 
1969.
Originally published as Vieillissement naturel de matériaux composites sous contrainte de torsion, in Revue Générale du Caoutchouc et des plastiques: Plastiques, 1968, 5 (4), 235-42.