There are no universal ternary quadratic forms over biquadratic fields

A lower bound for the rank of a universal quadratic form with integer coefficients in a totally real number field

(2019) Pavlo Yatsyna   COMMENTARII MATHEMATICI HELVETICI

Universal quadratic forms and indecomposables over biquadratic fields

(2018) Martin Čech et al.   MATHEMATISCHE NACHRICHTEN

Universal quadratic forms over multiquadratic fields

(2017) Vítězslav Kala et al.   RAMANUJAN JOURNAL

UNIVERSAL QUADRATIC FORMS AND ELEMENTS OF SMALL NORM IN REAL QUADRATIC FIELDS

(2016) VÍTĚZSLAV KALA   BULLETIN OF THE AUSTRALIAN MATHEMATICAL SOCIETY

Norms of indecomposable integers in real quadratic fields

(2016) Vítězslav Kala   JOURNAL OF NUMBER THEORY

A refinement of the Dress–Scharlau theorem

(2016) Se Wook Jang et al.   JOURNAL OF NUMBER THEORY

Number fields without n-ary universal quadratic forms

(2015) VALENTIN BLOMER et al.   MATHEMATICAL PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY

Universality of a non-classical integral quadratic form over Q ( \sqrt 5 )

(2009) Jesse Ira Deutsch   ACTA ARITHMETICA