His Eco en lo vacío, 1951‏

Real Academia Española WWW site, viewed April 12, 2019‏ (in article dated April 11, 2019: the philologist, writer, professor of Spanish literature and corresponding academician of the Real Academia Española, Gonzalo Sobejano (1928-2019), died yesterday, April 10, at age 91 in New York, U.S.; studied Romance philology; obtained doctorate from Univ. de Madrid with the thesis "El epíteto en la lírica española"; continued his university career in the U.S. as a prof. at the universities at Pittsburgh, Pa., Queens College, Middlebury College, Maryland, Princeton, Berkeley and Columbia, where he became a full professor)‏

Biblioteca virtual Miguel de Cervantes, via WWW, viewed April 12, 2019‏ ‎ (Gonzalo Sobejano; Gonzalo Sobejano Esteve was born Jan. 10, 1928, in Murcia)