@article{Zlamal:1973, author = {Zl\'{a}mal, Milo\v{s}}, doi = {10.1137/0710022}, issn = {0036-1429}, journal = {SIAM Journal on Numerical Analysis}, month = mar, number = 1, pages = {229--240}, title = {{Curved Elements in the Finite Element Method. I}}, volume = 10, year = 1973 }