verifiyng the ABCL packages

Hi!

Sorry if  this question sounds  trivial (likely it  is) but how  can I
verify the packages downloaded on the ABCL website?

I am able to download the signature file (*.asc) but I do not know how
to find the public key to match the signature.

----------------
$ gpg --verify abcl-bin-1.9.2.tar.gz.asc
gpg: assuming signed data in 'abcl-bin-1.9.2.tar.gz'
gpg: Signature made Wed Jun 21 10:01:48 2023 CEST
gpg:                using DSA key 5491D207FF9ECDE0BEA277772A9641104DB1773D
[...]
gpg: Can't check signature: No public key
----------------            ^^^^^^^^^^^^^


Thanks in advance!
C.