SAO 244567 : a post-AGB star which has turned into a planetarey nebula within the last 40 years.
Journal article published in 1993 by
M. Parthasarathy,
P. Garcia-Lario,
S. R. Pottasch,
A. Manchado,
J. Clavel,
D. de Martino 
,
G. C. M. van de Steene,
K. C. Sahu
,
G. C. M. van de Steene,
K. C. Sahu
