Alber, M., & Reemtsen, R. (2007). Intensity modulated radiotherapy treatment planning by use of a barrier-penalty multiplier method. Optimization Methods & Software, 22(3), 391. https://doi.org/10.1080/10556780600604940
Chicago Style (17th ed.) CitationAlber, M., and R. Reemtsen. "Intensity Modulated Radiotherapy Treatment Planning by Use of a Barrier-penalty Multiplier Method." Optimization Methods & Software 22, no. 3 (2007): 391. https://doi.org/10.1080/10556780600604940.
MLA (9th ed.) CitationAlber, M., and R. Reemtsen. "Intensity Modulated Radiotherapy Treatment Planning by Use of a Barrier-penalty Multiplier Method." Optimization Methods & Software, vol. 22, no. 3, 2007, p. 391, https://doi.org/10.1080/10556780600604940.
Warning: These citations may not always be 100% accurate.