Math Symbols for Laplace- and Z-Operators

[HpG]

Hi 

For some technical formulae I need to have the
Symbol for Laplace (a nice big "L" in script style) and
for the z-transform a nice big "Z" also in script style.
Do these two characters exist in some math-package,
if so, wich package.

Your help is very much appreciated.
(please e-mail me directly, cause I am not
on the mailing-list. Thanks.
[EMAIL PROTECTED]

Hanspeter