Celebratio Mathematica

C. S. Mor­awetz: “Well-posed prob­lems and tran­son­ic flow,” pp. 325–​333 in Pro­ceed­ings of the X-th sym­posi­um on ad­vanced prob­lems and meth­ods in flu­id mech­an­ics (Rynia, Po­land, 6–11 Septem­ber 1971), part 1. Edi­ted by W. Fisz­don, Z. Pło­chocki, and M. Bratos. Flu­id dy­nam­ics trans­ac­tions 6. Państ­wowe Wydawn­ict­wo Naukowe (Warsaw), 1971. MR 502811 incollection