Zienkiewicz, O. C. (2000). Achievements and some unsolved problems of the finite element method. International journal for numerical methods in engineering, 47(1-3), 9-28. https://doi.org/10.1002/(SICI)1097-0207(20000110/30)47:1/3<9::AID-NME793>3.0.CO;2-P
Chicago Style (17th ed.) CitationZienkiewicz, O. C. "Achievements and Some Unsolved Problems of the Finite Element Method." International Journal for Numerical Methods in Engineering 47, no. 1-3 (2000): 9-28. https://doi.org/10.1002/(SICI)1097-0207(20000110/30)47:1/3<9::AID-NME793>3.0.CO;2-P.
MLA (9th ed.) CitationZienkiewicz, O. C. "Achievements and Some Unsolved Problems of the Finite Element Method." International Journal for Numerical Methods in Engineering, vol. 47, no. 1-3, 2000, pp. 9-28, https://doi.org/10.1002/(SICI)1097-0207(20000110/30)47:1/3<9::AID-NME793>3.0.CO;2-P.