@article{SM_2013_204_7_a2,
     author = {A. A. Bobodzhanov and V. F. Safonov},
     title = {The method of normal forms for singularly perturbed systems of {Fredholm} integro-differential equations with rapidly varying kernels},
     journal = {Sbornik. Mathematics},
     pages = {979--1002},
     publisher = {mathdoc},
     volume = {204},
     number = {7},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2013_204_7_a2/}
}