[1] I. Gaál: Diophantine equations and power integral bases. Birkhauser Boston, 2002. MR 1896601

[2] I. Gaál A. Pethő, M. Pohst: On the resolution of index form equations in biquadratic number fields, III. The bicyclic biquadratic case. J. Number Theory, 53 (1995), 100-114. DOI 10.1006/jnth.1995.1080 | MR 1344834

[3] M. N. Gras, F. Tanoe: Corps biquadratiques monogénes. Manuscripta Math., 86 (1995), 63-79. DOI 10.1007/BF02567978 | MR 1314149 | Zbl 0816.11058

[4] T. Nakahara: On the indices and integral bases of non-cyclic but abelian biquadratic fields. Archiv. der Math., 41 (1983), 504-508. DOI 10.1007/BF01198579 | MR 0731633 | Zbl 0513.12005

[5] W. Narkiewicz: Elementary and Analytic Theory of Algebraic Numbers. Second Edition, Springer Verlag, 1990. MR 1055830 | Zbl 0717.11045

[6] G. Nyul: Power integral bases in totally complex biquadratic number fìelds. Acta Acad. Paed. Agriensis, Sectio Mathematicae, 28 (2001), 79-86. MR 1875563 | Zbl 0988.11011

[7] B. Schmal: Diskriminanten, Z-Ganzheitsbasen und reiative Ganzheitsbasen bei multiquadratischen Zahlkörpern. Arch. Math., 52 (1989), 245-257. DOI 10.1007/BF01194387 | MR 0989879

[8] K. S. Williams: Integers of biquadratic fields. Canad. Math. Bull., 13 (1970), 519 526. DOI 10.4153/CMB-1970-094-8 | MR 0279069 | Zbl 0205.35401