1                     Lange             1930, PZ, 3, 41
 2 1933AN....250....9L Lause
 3                     Mergentaler       1994, private communication
 4 1936AN....260..289L Lause
 5                     Tsudovitcheva     1952, PZ, 9, 133
 6                     Kaho              1950, Tokyo Bull. Sec. Ser., 30, 217
 7                     Kaho              1952, Tokyo Bull. Sec. Ser., 49, 383
 8                     Rosino & Nobili   1955, Publ. Bolonia, 6, 26
 9                     Huth              1963, Mitt. Var. Stars, 2, 112
10                     Haussler          1990, HarZi, 91, 1
11 1962IBVS...13....1A Ahnert
12 1969Orion..14...46D Diethelm & Locher
13 1969Orion..14...81D Diethelm & Locher
14 1969Orion..14..109L Locher & Diethelm
15 1977AN....298..121B Braune et al.
16                     Diethelm          1977, BBSAG Bull., 31, 1
17 2004omte.book.....B Baldwin & Samolyk 10, 29
18 1982BAVSM..34.....B Braune & Mundry
19                     Diethelm          1982, BBSAG Bull., 59, 1
20 1983BAVSM..36.....B Braune et al.
21 1986BAVSM..43.....H Hubscher et al.
22                     Diethelm          1986, BBSAG Bull., 79, 1
23                     Peter             1993, BBSAG Bull., 103, 1
24                     Diethelm          1995, BBSAG Bull., 108, 1
25                     Peter             1995, BBSAG Bull., 109, 1
26 1996BAVSM..93....1H Hubscher & Agerer
27                     Quester           1999, BAVRu, 48, 65
28                     Peter             1998, BBSAG Bull., 117, 1
29                     Zakrzewski        2012, private communication
30 2002IBVS.5296....1A Agerer & Hubscher Cat. J/other/IBVS/5296
31 2001BAVSM.143....1H Hubscher
32 2003IBVS.5416....1N Nagai
33 2004IBVS.5493....1N Nelson            Cat. J/other/IBVS/5493
34 2005IBVS.5592....1K Krajci            Cat. J/other/IBVS/5592
35                     Hubscher          2005, BAV Mitt., 171, 1
36 2006IBVS.5731....1H Hubscher et al.
37                     Baldwin & Samolyk 2007, Obs. Min. Timings Ecl. Binaries, 12, 1
38 2007IBVS.5802....1H Hubscher
39 2007IBVS.5806....1K Krajci
40 2008JAVSO..36..171S Samolyk
41 2009IBVS.5874....1H Hubscher et al.
42 2009IBVS.5889....1H Hubscher et al.
43 2008OEJV...94....1B Brat et al.
44 2009IBVS.5875....1N Nelson
45 2010IBVS.5918....1H Hubscher et al.
46 2009JAVSO..37...44S Samolyk
47 2010JAVSO..38..183S Samolyk           Cat. J/other/JAVSO/38.183
48                     Nagai             2011, Var. Star Bull. Japan, 51, 1
49 2011IBVS.5974....1D Dvorak
50 2011OEJV..137....1B Brat et al.
51 2011IBVS.5960....1D Diethelm
52 2011JAVSO..39..177S Samolyk
53                     Samolyk           2012, JAVSO, 40, 177
54 2013JAVSO..41..122S Samolyk
55 2012IBVS.6029....1D Diethelm
56                     Hubscher et al.   2013, IBVS, 5048, 1
57                     Nagai             2014, Var. Star Bull. Japan, 56, 1
58                                       Present work.