Jean-Paul Salvetat, G. Briggs, Jean-Marc Bonard, Revathi Bacsa, Andrzej Kulik, Thomas Stöckli, Nancy Burnham, László Forró,
Elastic and Shear Moduli of Single-Walled Carbon Nanotube Ropes Physical Review Letters. ,vol. 82, pp. 944- 947 ,(1999) ,
10.1103/PHYSREVLETT.82.944