Dias, Joao Paulo, y Mario Figueira. «A Remark on the Blow-up of the Solutions of the Equation ut+f(u)a(u)ux=h(x,u)». Revista Matemática Complutense 9, no. 2 (enero 1, 1996): 385. https://doi.org/10.5209/rev_REMA.1996.v9.n2.17588.