1.	U. Burkert and N. L. Allinger, Molecular Mechanics, American Chemical Society, 
	Washington DC, 1982.
2.	Program available from SERENA SOFTWARE, P.O. BOX, 3076, BLOOMINGTON, 
	IN. 47402-3076, USA.
3.	N.L. Allinger, J. Am. Soc. 99 (1977) 8127.
4.	N.L. Allinger and J.T. Sprague, J. Am. Soc., 95 (1973) 3893.
5.	C. A. Haasnoot, A. A. M. Leeuw and C.Altona, Tetrahedron, 36 (1980) 2783.
6.	D. Cremer and J. A. Pople, J. Am. Chem. Soc., 97 (1975) 1354.
7.	K. Sthal, Inorganica Chem. Acta, 75 (1983) 85-91.
8.	D. G. Evans and J. C. A. Boeyens, Acta Cryst., B45 (1989) 581-90.
9.	PLUTO option inside the PCDISPLAY program, available from SERENA 
	SOFTWARE, P.O. 	BOX, 3076, BLOOMINGTON, IN. 47402-3076, USA.