http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
v.1. Constant and varying : electro motive force. - xvi, 143 σ. - 1994 -- v.2. Mechanical systems : study of some fundamental processes in physics. - xxii, 194 σ. - 1994.