3
I would cautiously suggest
SmartSection I'm using it in a magazine/journal context on an unfinished site. It will allow you to attach PDFs and also abstracts can be created in the foretext section. It is also possible to deny the full 'read more' full text from anonymous users, but make it available to registered (or subscribed) users.
To give it a professional look you would have to adjust the templates a bit. It's a very flexible module with several features that you can turn on/off.