PHYSICAL CONDITIONS IN NUCLEI OF M51 AND M81

[31] RECOMBINATION SPECTRA .1. CALCULATIONS FOR HYDROGENIC IONS IN THE LIMIT OF LOW DENSITIES [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1964, 127 (02) : 145 - 163

[32] Sandage A., 1961, HUBBLE ATLAS GALAXIE

[33] SANDAGE A, 1967, GALAXIES UNIVERSE ED

[34] Seaton M. J., 1962, OBSERVATORY, V82, P111

[35] ELECTRON TEMPERATURES AND ELECTRON DENSITIES IN PLANETARY NEBULAE [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1954, 114 (02) : 154 - 171

[36] RELATIVE [O II] INTENSITIES IN GASEOUS NEBULAE [J]. ASTROPHYSICAL JOURNAL, 1957, 125 (01) : 66 - 83

[37] APPROXIMATE ABUNDANCES OF LIGHT ELEMENTS FROM MOLECULAR SPECTRA OF M AND S STARS [J]. ASTROPHYSICAL JOURNAL, 1966, 146 (02) : 399 - &

[38] SPINRAD H, 1967, PRIVATE COMMUNICATIO

[39] SWAMY KSK, 1967, AP J, V147, P529

[40] MULTICOLOR PHOTOELECTRIC PHOTOMETRY OF BRIGHT GALAXIES .2. [J]. ASTRONOMICAL JOURNAL, 1963, 68 (05) : 302 - &

[31] RECOMBINATION SPECTRA .1. CALCULATIONS FOR HYDROGENIC IONS IN THE LIMIT OF LOW DENSITIES [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1964, 127 (02) : 145 - 163

[32] Sandage A., 1961, HUBBLE ATLAS GALAXIE

[33] SANDAGE A, 1967, GALAXIES UNIVERSE ED

[34] Seaton M. J., 1962, OBSERVATORY, V82, P111

[35] ELECTRON TEMPERATURES AND ELECTRON DENSITIES IN PLANETARY NEBULAE [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1954, 114 (02) : 154 - 171

[36] RELATIVE [O II] INTENSITIES IN GASEOUS NEBULAE [J]. ASTROPHYSICAL JOURNAL, 1957, 125 (01) : 66 - 83

[37] APPROXIMATE ABUNDANCES OF LIGHT ELEMENTS FROM MOLECULAR SPECTRA OF M AND S STARS [J]. ASTROPHYSICAL JOURNAL, 1966, 146 (02) : 399 - &

[38] SPINRAD H, 1967, PRIVATE COMMUNICATIO

[39] SWAMY KSK, 1967, AP J, V147, P529

[40] MULTICOLOR PHOTOELECTRIC PHOTOMETRY OF BRIGHT GALAXIES .2. [J]. ASTRONOMICAL JOURNAL, 1963, 68 (05) : 302 - &