The enns of demonolatry practices differ in the standard manner of contact with the spirits of the goetia. Richard Dukante developed the idea for use with the "Dukante Hierarchy" which differs from the spirits listed in the Goetic Hierarchy.
That said I don't believe there are any enns for any of the spirits of the goetic hierarchy.
The main reason being that the Goetic Hierarchy pre-existed Dukante's and communicates with the spirits in a different manner. I don't see any reason that the method could not be applied to it, but it has not been done for you.
Similarly, one may apply the evocation techniques of the Ars Goetia to the Dukante or any other hierarchy. The reason I suggest developing your own is that a previous enn for Buer does not exist. Why not be the first? The largest list of enns that I know of can be found here.
http://www.ofs-demonolatry.org/enns.htmIt should be noted that even the enns for the Dukante Hierarchy are incomplete so, some personal work will most likely be needed to complete the system.