@misc{Goraj_Robert_Re-derivation,
 author={Goraj Robert},
 howpublished={online},
 publisher={Wydaw. Politechniki Częstochowskiej},
 language={eng},
 type={artykuł},
 title={Re-derivation of Laplace operator on curvilinear coordinates used for the computation of force acting in solenoid valves},
 keywords={Laplace operator, solenoid valve, armature, electromagnetic force},
}