"Linked Flux" is defined as the path integral of the magnetic vector potential. This is the line integral of a magnetic vector potential $A$ along a curve $C$. The line vector element $dr$ is the differential of position vector $r$.
Applicable units are those of quantitykind:MagneticFlux
http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=121-11-24
http://www.oxfordreference.com/display/10.1093/acref/acref-9780199233991-e-1800
http://dbpedia.org/resource/Magnetic_flux
$\Psi_m = \int_C A \cdot dr$, where $A$ is magnetic vector potential and $dr$ is the vector element of the curve $C$.