1. On the equation z1nz2n⋯zkn=yn in a free semigroup;Appel;Trans. Amer. Math. Soc.,1968
2. A proof of Ehrenfeucht’s Conjecture;Albert;Theoret. Comput. Sci.,1985
3. Uniqueness theorem for periodic functions;Fine;Proc. Amer. Math. Soc.,1965
4. Equivalence of infinite systems of equations in free groups and semigroups to finite subsystems;Guba;Mat. Zametki,1986
5. On the system of word equations x0u1ix1u2ix2u3ix3=y0v1iy1iv2iy2v3iy3(i=0,1,2,…) in a free monoid;Hakala;Theoret. Comput. Sci.,1999