1. Dräxler, P., Drozd, A., Golovachtchuk, N.S., Ovsienko, S.A., Zeldych, M.V.: Towards the classification of sincere weakly positive unit forms. Eur. J. Combin. 16, 1–16 (1995)
2. Dräxler, P., Golovachtchuk, N.S., Ovsienko, S.A., de la Peña, J.A.: Coordinates of maximal roots of weakly non-negative unit forms. Colloq. Math. 78(2), 163–193 (1998)
3. Happel, D., de la Peña, J.A.: Quadratic forms with a maximal sincere root. Can. Math. Soc. 18, 307–315 (1996)
4. Ovsienko, A.: Maximal roots of sincere weakly nonnegative forms. Lecture at the workshop on Quadratic Forms in the Representation Theory of Finite-Dimensional Algebras, Bielefeld, November 9–12 (1995)
5. Ringel, C.M.: Tame Algebras and Integral Quadratic Forms. Lecture Notes in Mathematics, vol. 1099. Springer, New York (1984)