We show that the complete list of regular excluded minors for the class of signed-graphic matroids is M*(G1),...,M*(G29),R15,R16. Here G1,...,G29 are the vertically 2-connected excluded minors for the class of projective-planar graphs and R15 and R16 are two regular matroids that we will define in the article.
& Zhou, X.
(2009). The Regular Excluded Minors for Signed-Graphic Matroids. Combinatorics Probability & Computing, 18 (6), 953-978.