On associated discriminants for polynomials in one variable. Gorodentsev, A.; Shapiro, B. — 1998 Beiträge zur Algebra und Geometrie
Hasse principle for the Hurwitz problem. Daniel B. Shapiro — 1978 Journal für die reine und angewandte Mathematik
On Multiples of Round and Pister Forms. Adrian Wadsworth; Daniel B. Shapiro — 1977 Mathematische Zeitschrift
Homotopy Classification of Nondegenerate Quasiperiodic Curves on the 2-sphere B. Z. Shapiro; B. A. Khesin — 1999 Publications de l'Institut Mathématique