The excitation of emission lines in late-type variables

[11] 1926, AP J, V63, P218

[12] 1933, OBSERVATORY, V56, P302

[13] 1926, AP J, V63, P308

[14] MT W CONTR, V311

[15] 1935, Z AP, V10, P133

[16] MT W CONTR, V490

[17] MT W CONTR, V309

[18] 1935, AP J, V81, P1

[19] MT W CONTR, V359

[20] 1928, AP J, V68, P9

[11] 1926, AP J, V63, P218

[12] 1933, OBSERVATORY, V56, P302

[13] 1926, AP J, V63, P308

[14] MT W CONTR, V311

[15] 1935, Z AP, V10, P133

[16] MT W CONTR, V490

[17] MT W CONTR, V309

[18] 1935, AP J, V81, P1

[19] MT W CONTR, V359

[20] 1928, AP J, V68, P9