B'inyan Hischaiyvus D'arev B'halvo'ah U'b'inyan Kinyan Al Yedei Gemiras Daas Gemurah Af B'li Maaseh Kinyan (Teshuvos RA''E Siman 37); B'SHOVAVI''M T''T

From Teshuvos Rebbe Akiva Eiger by R Yaakov Moishe Shurkin.