Proc Natl Acad Sci U S A, Vol. 97, No. 21. (10 October 2000), pp. 11149-11152.
Proc Natl Acad Sci U S A, Vol. 99, No. suppl. 1. (19 February 2002), pp. 2566-2572.
(2004), pp. 718-727.
(17 April 2006)
(2006), pp. 611-617.
Phys Rev E Stat Nonlin Soft Matter Phys, Vol. 73, No. 1 Pt 2. (January 2006)
(5 Dec 2006)
Physical Review E, Vol. 62, No. 2. (2000), 1842.
PNAS, Vol. 99, No. 8. (2002), pp. 5207-5211.
Physical Review Letters, Vol. 85, No. 21. (20 November 2000), 4629.
(2002)
Biometrika, Vol. 42 (1955), pp. 425-440.
(23 Jan 2002)
The International Information & Library Review, Vol. 30, No. 4. (December 1998), pp. 367-376.
Science, Vol. 149, No. 3683. (1965), pp. 510-515.
Scientometrics, Vol. 67, No. 1. (April 2006), pp. 107-120.
Scientometrics, Vol. 70, No. 2. (February 2007), pp. 459-489.
(1 December 2004)
ArXiv Physics e-prints (February 2007)
(18 Oct 2005)
(6 Jun 2001)
(25 March 2003)