mav would know: you got any ref you could pass on?

I believe mention is made of it in Sweet's Anglo-Saxon Grammar and probably in another one I have lying next my bed of a more recent vintage. I'll get back... No wait a minute, maybe I can amazon it. Nope, the likely candidates are all out of print so they don't show the cover. I'll have to get back to you. Lemme call myself up and leave me a message so I don't forget. There, now I gots no excuse.