Barndorff-Nielsen, O. and Bl<e6>sild, P (1981).
Hyperbolic distributions and ramifications: contributions to theory
and application.
In Statistical Distributions in Scientific Work,
eds., Taillie, C., Patil, G. P., and Baldessari, B. A., Vol. 4,
pp. 19--44. Dordrecht: Reidel.