@InProceedings{,
 author = { A. Nagórka, N. Sczygiol},
 booktitle = {Lecture Notes in Computer Science},
 title = {Implementation aspects of a recovery--based error estimator in finite element analysis},
 pages = {722--729},
 year = {2004},
 editor = {R. Wyrzykowski et al. (Eds.)},
 volume = {3019}
 }