@article{SM_2012_203_6_a5,
     author = {S. A. Stepin},
     title = {Asymptotic estimates for the kernel of the semigroup generated by a~perturbation of the biharmonic operator by a~potential},
     journal = {Sbornik. Mathematics},
     pages = {893--921},
     publisher = {mathdoc},
     volume = {203},
     number = {6},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2012_203_6_a5/}
}