Interior Hölder estimates for solutions of Schrödinger equations and the regularity of nodal sets
Journées équations aux dérivées partielles (1994), article no. 13, 9 p. 
@article{JEDP_1994____A13_0,
     author = {Hoffmann-Ostenhof, M. and Hoffmann-Ostenhof, T. and Nadirashvili, N.},
     title = {Interior {H\"older} estimates for solutions of {Schr\"odinger} equations and the regularity of nodal sets},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {13},
     pages = {1--9},
     publisher = {Ecole polytechnique},
     year = {1994},
     zbl = {0948.35501},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1994____A13_0/}
}
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Hoffmann-Ostenhof, M.; Hoffmann-Ostenhof, T.; Nadirashvili, N. Interior Hölder estimates for solutions of Schrödinger equations and the regularity of nodal sets. Journées équations aux dérivées partielles (1994), article  no. 13, 9 p. http://archive.numdam.org/item/JEDP_1994____A13_0/

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