Authors: Pottasch, SR Beintema, DA Salas, JB Feibelman, WA

Citation: Sr. Pottasch et al., Abundances of planetary nebulae NGC 7662 and NGC 6741, ASTRON ASTR, 380(2), 2001, pp. 684-694

Authors: Salas, JB Pottasch, SR Beintema, DA Wesselius, PR

Citation: Jb. Salas et al., The ISO-SWS spectrum of planetary nebula NGC 7027, ASTRON ASTR, 367(3), 2001, pp. 949-958