@article {knapp2000atomic, title = {Atomic carbon in the envelopes of carbon-rich post-asymptotic giant branch stars}, journal = {The Astrophysical Journal}, volume = {534}, year = {2000}, pages = {324}, publisher = {IOP Publishing}, author = {Knapp, G. R. and Crosas, M and Young, K and Ivezi{\'c}, {\.Z}eljko} }