[1] Wu Z Y Shu C G and Chen W P 2003 Chin. Phys. Lett.
20 1648

[2] Gieles M Athanassoula E and Portegies Zwart S F 2007
Mon. Not. R. Astron. Soc. 376 809

[3] Lamers H J G L M and Gieles M 2006 Astron.
Astrophys. 455 L17

[4] Piskunov A E et al 2007 Astron. Astrophys.
468 151

[5] de Grijs R et al 2008 Mon. Not. R. Astron. Soc.
Accepted

[6] Kouwenhoven M B N and de Grijs R 2008 Astron.
Astrophys. 480 103

[7] Wu Z Y et al 2007 Astrophys. J. 133 2061

[8] Wu Z Y et al 2006 Publ. Astron. Soc. Pacific.
118 1104

[9] Kroupa P 2001 Mon. Not. R. Astron. Soc. 322
231

[10] Spitzer L 1987 Dynamical Evolution of Globular
Clusters (Princeton, NJ: Princeton University Press)

[11] King I 1962 Astrophys. J. 67 471

[12] Monet D G et al 2003 Astrophys. J. 125 984

[13] Bonnarel F et al 2000 Astron. Astrophys. 143
33

[14] Gim M et al 1998 Publ. Astron. Soc. Pacific.
110 1172

[15] Pryor C and Meylan G 1993 ASP Conf. Ser. 50
357

[16] Innanen K A, Harris W E and Webbink R F 1983
Astrophys. J. 88 338

[17] Keenan D W 1981 Astron. Astrophys. 95 340

[18] Wu Z Y et al 2008 Mon. Not. R. Astron. Soc.
(submitted)

[19] Wu Z Y Zhou X and Ma J 2004 Chin. Phys. Lett.
21 418