Nicaise, Serge, y Ouahiba Zaïr. « Stability and Reconstruction Results of Point Sources by Boundary Measurements in Heteregeneous Trees». Revista Matemática Complutense 16, no. 1 (enero 1, 2003): 151–178. https://doi.org/10.5209/rev_REMA.2003.v16.n1.16865.