ANGULAR EXPANSIONS OF PLANETARY NEBULAE

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

[2] BAUM WA, 1960, CARNEGIE INSTITUTION, P18

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

[4] Curtis H.D., 1918, PUBLICATIONS LICK OB, V13, P55

[5] KEELER JE, 1908, PUBL LICK OBS, V8, P1

[6] LATYPOV AA, 1957, PUBL ASTRO OBS TASHK, V5, P31

[7] LILLER MH, 1962, AJ, V67, P276

[8] Liller W., 1965, PASP, V77, P25, DOI [10.1086/128147, DOI 10.1086/128147]

[9] THE SUB-SYSTEM OF PLANETARY NEBULAE [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1964, 76 (451) : 197 - 209

[10] MINKOWSKI R, 1964, REMARKS S PLANETARY

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

[2] BAUM WA, 1960, CARNEGIE INSTITUTION, P18

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

[4] Curtis H.D., 1918, PUBLICATIONS LICK OB, V13, P55

[5] KEELER JE, 1908, PUBL LICK OBS, V8, P1

[6] LATYPOV AA, 1957, PUBL ASTRO OBS TASHK, V5, P31

[7] LILLER MH, 1962, AJ, V67, P276

[8] Liller W., 1965, PASP, V77, P25, DOI [10.1086/128147, DOI 10.1086/128147]

[9] THE SUB-SYSTEM OF PLANETARY NEBULAE [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 1964, 76 (451) : 197 - 209

[10] MINKOWSKI R, 1964, REMARKS S PLANETARY