PROPERTIES OF SOME OLD PLANETARY NEBULAE

[1] Abell G. O., 1958, ASTROPHYS J SUPPL S, V3, P211

[2] GLOBULAR CLUSTERS AND PLANETARY NEBULAE DISCOVERED ON THE NATIONAL-GEOGRAPHIC-SOCIETY-PALOMAR OBSERVATORY SKY SURVEY [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1955, 67 (397) : 258 - 261

[3] NUCLEI OF OLD PLANETARY NEBULAE [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1964, 76 (453) : 382 - 384

[4] ELDERLY PLANETARY NEBULAE [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1961, 73 (434) : 323 - 323

[5] THE ABSORPTION-LINE SPECTRA OF THE CENTRAL STARS OF THE PLANETARY NEBULAE [J]. ASTROPHYSICAL JOURNAL, 1948, 108 (03) : 462 - 475

[6] SOME ASPECTS OF THE ABUNDANCE PROBLEM IN PLANETARY NEBULAE [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1964, 76 (452) : 279 - 288

[7] ALLER LH, 1965, LANDOLTBORNSTEIN, V1, P566

[8] U-B AND B-V COLORS OF BLACK BODIES [J]. ASTROPHYSICAL JOURNAL, 1961, 133 (03) : 874 - 882

[9] BERMAN L, 1937, LICK OBS B, V18, P57

[10] THE HYDROGEN RECOMBINATION SPECTRUM [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1958, 118 (05) : 477 - 495

[1] Abell G. O., 1958, ASTROPHYS J SUPPL S, V3, P211

[2] GLOBULAR CLUSTERS AND PLANETARY NEBULAE DISCOVERED ON THE NATIONAL-GEOGRAPHIC-SOCIETY-PALOMAR OBSERVATORY SKY SURVEY [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1955, 67 (397) : 258 - 261

[3] NUCLEI OF OLD PLANETARY NEBULAE [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1964, 76 (453) : 382 - 384

[4] ELDERLY PLANETARY NEBULAE [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1961, 73 (434) : 323 - 323

[5] THE ABSORPTION-LINE SPECTRA OF THE CENTRAL STARS OF THE PLANETARY NEBULAE [J]. ASTROPHYSICAL JOURNAL, 1948, 108 (03) : 462 - 475

[6] SOME ASPECTS OF THE ABUNDANCE PROBLEM IN PLANETARY NEBULAE [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1964, 76 (452) : 279 - 288

[7] ALLER LH, 1965, LANDOLTBORNSTEIN, V1, P566

[8] U-B AND B-V COLORS OF BLACK BODIES [J]. ASTROPHYSICAL JOURNAL, 1961, 133 (03) : 874 - 882

[9] BERMAN L, 1937, LICK OBS B, V18, P57

[10] THE HYDROGEN RECOMBINATION SPECTRUM [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1958, 118 (05) : 477 - 495