Stoykov, S.,
Uzunov, T., &
Grozeva, T.
().
Structural synthesis of linkage mechanisms for jib system of portal crane. // <I>General<D> machine design : Intern. conference GMD' 09, Ruse, 15-16 october 2009 : Сб. тр. "Общо машиностроително конструиране". - Русе, 2009, с. 173-176..