@article{FORUM_1991__3_2_186404,
     author = {Paolo Manselli and Sergio Vessella},
     title = {On {Continuous} {Dependence,} on {Noncharacteristic} {Cauchy} {Data,} for {Level} {Lines} of {Solutions} of the {Heat} {Equation.}},
     journal = {Forum mathematicum},
     pages = {513--522},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1991},
     zbl = {0726.35054},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1991__3_2_186404/}
}