On a class of extremal problems for polynomials in the unit circle Shapiro, H.S. — 1961 Portugaliae mathematica
The Winding of an Analytic Function. H.S. Shapiro Jahresbericht der Deutschen Mathematiker-Vereinigung
On the zeros of functions with finite Dirichlet integral and some related function spaces. H.S. Shapiro; A.L. Shields Mathematische Zeitschrift