@article{10_4064_aa_86_3_193_205,
     author = {Bjorn Poonen},
     title = {Some diophantine equations of the form $x^n + y^n = z^m$},
     journal = {Acta Arithmetica},
     pages = {193--205},
     publisher = {mathdoc},
     volume = {86},
     number = {3},
     year = {1998},
     doi = {10.4064/aa-86-3-193-205},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-86-3-193-205/}
}