Uniqueness of the Cauchy problem for a second order operator
Rendiconti del Seminario Matematico della Università di Padova, Tome 81 (1989), pp. 85-93 
@article{RSMUP_1989__81__85_0,
     author = {Del Santo, Daniele},
     title = {Uniqueness of the {Cauchy} problem for a second order operator},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {85--93},
     year = {1989},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {81},
     mrnumber = {1020188},
     zbl = {0699.35039},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1989__81__85_0/}
}
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Del Santo, Daniele. Uniqueness of the Cauchy problem for a second order operator. Rendiconti del Seminario Matematico della Università di Padova, Tome 81 (1989), pp. 85-93. https://www.numdam.org/item/RSMUP_1989__81__85_0/

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