String definitions needed

[Hellan,Kim KHE]

I need to find out what characters are allowed in the following ASN.1 string
types:
PRINTABLESTRING (I already know this one)
IA5STRING
T61STRING

Can anyone give me a hint to where these strings are defined?

TIA
Kim Hellan
KMD / KMD-CA
http://www.kmd-ca.dk
Mailto:[EMAIL PROTECTED]

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