The Gemara in the 10th perek of Pesachim with running commentary. This is probably the last in the series. A lot of good stuff from Rav Tzuriel shlita. As noted by Meir, the correspondence between the disappearance of shedim and the extinction of bas kol is suggested in the Emes l’Yaakov. See Rabbi Gil Student’s article at

http://www.aishdas.org/documents/mesukim/vaeira.pdf