1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B
1993ApJ...407..316B