1. Agler, J., Lykova, Z., Young, N.J.: Geodesics, retracts, and the norm-preserving extension property in the symmetrized bidisc, Mem. Am. Math. Soc. 258 (2019), no. 1242, vii+108 pp. ISBN: 978-1-4704-3549-3
2. Agler, J., Young, N.J.: The hyperbolic geometry of the symmetrized bidisc. J. Geom. Anal. 14, 375–403 (2004)
3. Agler, J., Young, N.J.: A model theory for $$\Gamma $$-contractions. J. Operator Theory 49, 45–60 (2003)
4. Aherna, P., Cuckovic, Z.: A theorem of Brown–Halmos type for Bergman space Toeplitz operators. J. Funct. Anal. 187, 200–210 (2001)
5. Alexander, H., Wermer, J.: Several Complex Variables and Banach Algebras. Springer, New York (1998)