About: http://webisa.webdatacommons.org/99197475

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	where $\alpha$ is the polarizability of the sphere, for details see e.g. Electromagnetic mixing formulas and applications by Sihvola.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com