We investigate univariate and bivariate binary subdivision schemes based on cubic B-splines with double knots. It turns out that double knots change the behaviour of a uniform cubic scheme from primal to dual. We focus on the analysis of new bivariate cubic schemes with double knots at extraordinary points. These cubic schemes produce C surfaces with the original Doo-Sabin weights.

Early in 1961 a city-wide oral poliomyelitis vaccination program was under-taken in the city of Middletown, Connecticut by the and his staff. A description of various aspects of this so-called mass vaccination project follows in the papers that make up this issue of THE YALE JOURNAL OF BIOLOGY AND MEDICINE. In the Middletown program some 10,000 children under the age of 18 received oral poliovi...

Ante el riesgo real de ocurrencia brotes parálisis fláccida aguda en la región debidos a poliovirus derivado vacuna Sabin o importación salvaje, Sociedad Latinoamericana Infectología Pediátrica comisionó un grupo ad hoc expertos integrantes del Comité Vacunas y Biológicos institución, para redactar documento oficial posición sobre necesidad imperiosa incrementar los niveles inmunizac...