@InProceedings{ Schweitzer:2008, author = {M.~A. Schweitzer}, title = {{A} {P}article-{P}artition of {U}nity {M}ethod---{P}art {VIII}: {H}ierarchical {E}nrichment}, booktitle = {{M}eshfree {M}ethods for {P}artial {D}ifferential {E}quations {IV}}, year = {2008}, editor = {M. Griebel and M.~A. Schweitzer}, volume = {65}, pages = {277--299}, publisher = {Springer}, annote = {proceedings,refereed series,ag-schweitzer}, series = {Lecture Notes in Computational Science and Engineering} }