@article{702190,
     title = {The parabolic equations as a limiting case of hyperbolic and elliptic equations},
     booktitle = {Differential Equations and Their Applications},
     series = {GDML\_Books},
     publisher = {Publishing House of the Czechoslovak Academy of Sciences},
     address = {Prague},
     year = {1963},
     pages = {243-247},
     mrnumber = {MR0177213},
     zbl = {0161.30303},
     url = {http://dml.mathdoc.fr/item/702190}
}

Zlámal, M. The parabolic equations as a limiting case of hyperbolic and elliptic equations, dans Differential Equations and Their Applications, GDML_Books,  (1963), pp. 243-247. http://gdmltest.u-ga.fr/item/702190/