Derrick, William R. Extremal length and Rayleigh’s reciprocal theorem. (English) Zbl 0363.31003 Appl. Anal. 6, 119-125 (1977). MSC: 31B15 31A15 94C10 31C15 PDFBibTeX XMLCite \textit{W. R. Derrick}, Appl. Anal. 6, 119--125 (1977; Zbl 0363.31003) Full Text: DOI
Derrick, William R. Extremal length and Rayleigh’s reciprocal theorem. (English) Zbl 0358.31003 Appl. Anal. 6, 119-125 (1977). MSC: 31A15 31B15 94C10 PDFBibTeX XMLCite \textit{W. R. Derrick}, Appl. Anal. 6, 119--125 (1977; Zbl 0358.31003) Full Text: DOI