group_concat() alternative for mysql < 4.1?

[Victor Spång Arthursson]

Hi all!

I'm wondering - are there any alternative to the function 
group_concat() for mysql servers prior to 4.1?

The reason for asking is that I'm building a library database, where 
each book can have n numbers of authors, where n >= 0. In listings I 
want to get all the authors of one book as a comma delimited (or 
something) string in one field...

Sincerely

Victor