@misc{Volterra_Vito_(1860–1940)_The_1915,
 author={Volterra, Vito (1860–1940)},
 volume={Vol. 4, 1914-1925},
 copyright={Public Domain},
 address={Roma},
 journal={Opere matematiche : memorie e note / Vito Volterra},
 howpublished={online},
 year={1915},
 publisher={Accademia Nazionale dei Lincei},
 language={ita},
 title={The theory of permutable functions. Lectures delivered at Princeton University, October 1912},
 type={Text},
}