RT Book, Section T1 On regular and stable ruled surfaces in P3 A1 Arrondo Esteban, Enrique A1 Pedreira, M. A1 Sols LucĂ­a, Ignacio PB Springer SN 0075-8434 YR 1989 FD 1989 LK https://hdl.handle.net/20.500.14352/60544 UL https://hdl.handle.net/20.500.14352/60544 DS Docta Complutense RD 28 dic 2025