Introductory text or abstract, then
to read more:
Here is the doc
so the steps are:
upload pdf to drive
change settings to public
copy the link
then in blogger, new post, compose, insert link and whatever text
then publish, it will appear on Google+.
Check: as a reader, click on link, it takes you to the pdf on owner's google+ or googleDocs whatever, click yet again on that and it leads to to full pdf.
If this is what Google does with simple pdf publication, how can we trust them to design a self-driveling car?