1980Natur.285..305L

1983MNRAS.203..545L

1986A&A...155....1L

1987Natur.326..442F

1988AJ.....96.1215P

1988AJ.....96.1520F

1989Ap&SS.157..227F

1990AJ....100....1F

1991VA.....34...51S

1992ApJ...391L..29S

1993ApJ...410..803H

1993PASP..105.1016K

1994AJ....107.1444S

1994AJ....108.2362R

1994ApJ...421..816T

1994ApJ...422L...9G

1994ApJ...435L..23D

1995A&A...295L...9P

1995A&A...297...61B

1995A&A...299..641R

1995Ap&SS.260..199D

1995ApJ...439..730P

1995ApJ...441..494I

1995ApJ...442..492D

1995ApJ...443..570Z

1995ApJ...443L..69S

1995ApJ...445L..15I

1995ApJ...449L..23D

1995ApJ...451L..17R

1995ApJ...453...48D

1995ApJ...453..559N

1995ApJ...453..599C

1995PASA...12..119C

1996A&A...307..417P

1996A&A...310..477F

1996A&A...313..909G

1996A&A...313L..25P

1996A&AS..118...65B

1996AJ....111..130D

1996AJ....111.2303B

1996AJ....112.1035H

1996AJ....112.1335W

1996AJ....112.1868S

1996ApJ...456L..21P

1996ApJ...458..100B

1996ApJ...461..525D

1996ApJ...466L...5D

1996ApJ...469..629M

1996ApJ...471..203B

1996ApJ...472..327B

1996ApJ...472L..13O

1996JRASC..90Q.309R

1996MNRAS.282.1159G

1996MNRAS.283.1388M

1997AJ....114..511R

1997AJ....114.1488H

1997ApJ...474L...1Z

1997ApJ...480..290B

1997ApJ...483L..21D

1997ApJ...484..741R

1997ApJ...486...60D

1997ApJ...489L.153B

1997MNRAS.291..488H

1998AJ....115..890C

1998AJ....115.1340S

1998AJ....116.2617S

1998ApJ...492L.125S

1998ApJ...492L.139S

1998ApJ...495..698G

1998ApJ...496L..93D

1998ApJ...499L.135S

1998ApJ...505L..95W

1998MNRAS.296..585F

1998MNRAS.298.1133P

1999A&A...344L..67H

1999A&A...345...73P

1999A&A...348..418H

1999A&AS..135...83M

1999AJ....117..225W

1999AJ....117.1490P

1999ApJ...511..389L

1999ApJ...517..668C

1999ApJS..120..265I

1999ApJS..122..431C

1999PASP..111..794C