1990ApJ...359L..59D
1990ApJ...356..641P
1990AJ....100.1701S
1990ApJ...358..617D
1990A&A...236..449D
1991ApJ...367L..27B
1991AJ....101.2207M
1991AJ....102.2091B
1991A&A...252..645D
1992AJ....104..241A
1992AJ....104.2217A
1992ApJ...384..624P
1992A&A...259L..19Q
1992AJ....104.1982D
1992AJ....104.2224R
1993AJ....106.2486H
1993ApJ...413L.129P
1993AJ....106.1118Q
1993ApJ...406..215Q
1993ApJ...416L..25Q
1993AJ....105..736B
1993A&A...270..315D
1994AJ....107.1859H
1994AJ....108..326H
1994A&A...283L..13Q
1994A&A...285..541Q
1994AJ....107.1469D
1995AJ....110..376H
1995AJ....110.1433D
1995AJ....109..378D
1995A&A...300..219S
1995Ap&SS.224..447D
1995ApJ...449..365G