@article{JRAM_1958__199_150361,
     author = {M.Z. von Krzywoblocki and R.R. Gold},
     title = {On {Superposability} and {Self-Superposability} {Conditions} for {Hydrodynamic} {Equations} {Based} on {Continuum.} {I.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {139--164},
     publisher = {mathdoc},
     volume = {199},
     year = {1958},
     zbl = {0084.41302},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1958__199_150361/}
}