Positivity of third order linear recurrence sequences. - Vichian Laohakosol; Pinthira Tangsupphathawat (Discret. Appl. Math., 2009)

Minimal Polynomials of Algebraic Cosine Values at Rational Multiples of π. - Pinthira Tangsupphathawat; Vichian Laohakosol (J. Integer Seq., 2016)

Minimal Polynomials of Algebraic Cosine Values, II. - Pinthira Tangsupphathawat; Takao Komatsu; Vichian Laohakosol (J. Integer Seq., 2018)