1 Esipov, e.a., AZh, 1993, 70, 1
 2 Wozniak, e.a., AASS, 1995, 111, 115
 3 Artamonov, e.a., AZh, 1997, 74, 654
 4 Kalloglian, Soobsch. Byurakan. Obs., 1963, 33, 19
 5 Kalloglian, Soobsch. Byurakan. Obs., 1963, 33, 19; Kalloglian, Soobsch. Byurakan. Obs., 1958, 25, 35
 6 Kalloglian, Soobsch. Byurakan. Obs., 1963, 33, 19; Aguerri, e.a., AJ, 1998, 116, 2136; Shapovalova, Astrofiz. Issled., 1975, 7, 41
 7 Ryder, Aust. J. Phys., 1992, 45, 395
 8 Burkhead, Burgess, AJ, 1973, 78, 606
 9 Hodge, ApJSS, 1978, 37, 429
10 Wozniak, e.a., AASS, 1995, 111, 115; Ohta, e.a., ApJ, 1990, 357, 71
11 Hackwell, Schweizer, ApJ, 1983, 265, 643
12 Gusev, Esipov, AZh, 1996, 73, 357
13 Ohta, e.a., ApJ, 1990, 357, 71
14 Sersic, Donzelli, AASS, 1983, 121, 297
15 Chapelon, e.a., AA, 1999, 345, 81
16 Artamonov, e.a., AZh, 1994, 71, 675
17 Bettoni, e.a., AA, 1988, 197, 69
18 Alloin, Nieto, AASS, 1982, 50, 491; Chapelon, e.a., AA, 1999, 345, 81; Kalloglian, Soobsch. Byurakan. Obs., 1969, 40, 15
19 Kalloglian, Soobsch. Byurakan. Obs., 1969, 40, 15
20 Boerngen, e.a., Afz, 1977, 13, 233
21 Shaw, e.a., MNRAS, 1995, 274, 369
22 Chapelon, e.a., AA, 1999, 345, 81; Shaw, e.a., MNRAS, 1995, 274, 369
23 Pence, Vaucouleurs, ApJ, 1985, 298, 560
24 Borchkhadze, Afz, 1974, 10, 493
25 Nieto, Tiennot, AA, 1984, 131, 291
26 Capaccioli, Mem. Soc. Astr. Ital, 1973, 44, 417
27 Kalloglian, Soobsch. Byurakan. Obs., 1963, 33, 19; Chapelon, e.a., AA, 1999, 345, 81
28 Benedict, e.a., AJ, 1992, 103, 757; Lynds, e.a., ApJ, 1973, 182, 659
29 Shaw, e.a., MNRAS, 1995, 274, 369; Benedict, AJ, 1976, 81, 89
30 Storchi-Bergmann, Pastoriza, ApJ, 1986, 304, 305
31 Wozniak, e.a., AASS, 1995, 111, 115; Chapelon, e.a., AA, 1999, 345, 81
32 Odewahn, AJ, 1991, 101, 829
33 Ohta, e.a., ApJ, 1990, 357, 71; Shaw, e.a., MNRAS, 1995, 274, 369
34 Sakka, e.a., PASJ, 1973, 25, 317
35 Wakamatsu, Hamabe, ApJSS, 1984, 56, 283
36 Duval, Athanassoula, AA, 1983, 121, 297
37 Artamonov, e.a., AZh, 2000, in press
38 Artamonov, e.a., AZh, 1999, 76, 438
39 Buta, ApJSS, 1987, 64, 383
40 Broeils, Knapen, AASS, 1991, 91, 469
41 Wozniak, e.a., AASS, 1995, 111, 115; Aguerri, e.a., AJ, 1998, 116, 2136
42 Kalloglian, Kalloglian, Afz, 1967, 3, 209
43 Wozniak, e.a., AASS, 1995, 111, 115; Kalloglian, Soobsch. Byurakan. Obs., 1963, 33, 19; Benedict, AJ, 1982, 87, 76; Blackman, MNRAS, 1983, 202, 379; Okamura, PASJ, 1978, 30, 91; Quillen, e.a., ApJ, 1995, 441, 549
44 Wozniak, e.a., AASS, 1995, 111, 115; Artamonov, e.a., AZh, 1997, 74, 654
45 Wozniak, e.a., AASS, 1995, 111, 115; Aguerri, e.a., AJ, 1998, 116, 2136; Gusev, Esipov, AZh, 1996, 73, 357; Okamura, PASJ, 1978, 30, 91
46 Gusev, 1993, unpubl.