Help please? re German AGO/Otto Pushers

Can anyone point me to the best print reference works and/or sites on the net regarding the AGO and Otto German Pushers?

Is there a definitive book on the subject?

I'm embarassed to flaunt my ignorance, but I didn't even know the Central Powers *made* pusher designs until I saw these pics:

http://204.83.160.230/archive/b/images/otto.jpg
http://204.83.160.230/archive/a/images/AGO_pusher.jpg
http://204.83.160.230/archive/w/images/Cou...deroyRunway.jpg
http://204.83.160.230/archive/w/images/otto_pusher.jpg

As you can see, I'm NOT speaking of the AGO CI and CII types, the ones with the twin boom P-38 type tail structure. I was at least familiar with these types.

Rather, these are more like the German equivalent of the Airco DH1 and DH2.

However, other than these pictures, I can find nothing about these planes, either on the web or in book subject searches.

Surely there is a comprehensive work on these types somewhere? At very least something like a book on German Pushers that would cover them with a few pages each? Can anyone advise me on this?

What I have been able to discover, to my surprise, is that AGO Flugzeugwerke (Aerowerke Gustav Otto, or alternatively, Aktien Gesellschaft Otto, based in Johannisthal, on the outskirts of Berlin) was a branch of Otto (Otto Werke,
Munich) apparently financed by AEG. In 1916 they were merged with another big German engineering firm and the conglomeration was rechristened Bavarisch Motor Werke, better known these days as BMW, at which time they
started building (among other things) motorbikes and cars, which they still do rather well today by all accounts.

Thank you in advance for any help.

Cheers,

Iban.