Assume you have access only to an electronic library. Use one of the electronic databases to locate

Question:

Assume you have access only to an electronic library. Use one of the electronic databases to locate the following cases. Read only the case head note and summarize:
a. Davis v. U.S., 495 U.S. 472; 90-1 USTC 50,270; 65 AFTR2d 90-1051
b. B. Tudyman (You don't know anything more about this case.)
c. Sanford Reffett, 39 TC 869
d. Miller v. Commission, 2005-1 USTC 50,101 (N.D. Calif)