@article{10_4064_sm165_3_3,
     author = {M. Bertoldi and S. Fornaro},
     title = {Gradient estimates in
 parabolic problems with unbounded coefficients},
     journal = {Studia Mathematica},
     pages = {221--254},
     publisher = {mathdoc},
     volume = {165},
     number = {3},
     year = {2004},
     doi = {10.4064/sm165-3-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm165-3-3/}
}