BibTex format
@article{Pisarevskii:1998:10.1070/rd1998v003n01abeh000058,
author = {Pisarevskii, V and Shilnikov, A and Turaev, D},
doi = {10.1070/rd1998v003n01abeh000058},
journal = {Regular and Chaotic Dynamics},
pages = {19--27},
title = {Asymptotic normal forms for equilibria with a triplet of zero characteristic exponents in systems with symmetry},
url = {http://dx.doi.org/10.1070/rd1998v003n01abeh000058},
volume = {3},
year = {1998}
}