@inbook{inbookaa777f49,
title   = {Indices of Newton non-degenerate vector fields and a conjecture of Loewner for surfaces in "R POT.4"},
author = {Gutierrez, Carlos and Ruas, Maria Aparecida Soares},
year = {2003},
publisher = {Marcel Dekker},
journal   = {Real and Complex Singularities}
}