lkbib searches bibliographic databases for references that contain the keys
key... and prints any references found on the standard output.
lkbib will search any databases given by
-p options, and then a default database.
The default database is taken from the
REFER environment variable if it is set,
otherwise it is
/usr/dict/papers/Ind. For each database
filename to be searched,
if an index
filename.i created by
exists, then it will be searched instead;
each index can cover multiple databases.