@techreport{DeuflhardLeinenYserentant1988, author = {Peter Deuflhard and P. Leinen and Harry Yserentant}, title = {Concepts of an Adaptive Hierarchical Finite Element Code.}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {SC-88-05}, language = {eng}, year = {1988} }