Please recommend something about applying Object-Oriented Databases for dynamic languages (thinking about Ruby).
I understand that OODBs don't have a great mathematical foundation, but nonetheless the data I possibly could find is completely inadequate that i can start focusing on a brand new OODB.
Take a look at Won Kim's "Introduction to Object-Oriented Databases". It's considered an authoritative source around the matter.
EDIT: An alternate reference is "Object-Relational Database Development" by Paul Brown. It requires an itemOrrelational approach, which might be interesting because of the prevalence of relational technologies nowadays.
You will find several for pay papers:
Plus there is even the website odbms.org, that has assets online:
Finally I'd most likely try to find whitepapers or tech paperwork for any popular ODBMS like Caché.