@article{MS2_1981__49_166774,
     author = {S.E. Graversen and Murali Rao},
     title = {On strong {Markov} duals.},
     journal = {Mathematica Scandinavica},
     pages = {275--282},
     publisher = {mathdoc},
     volume = {49},
     year = {1981},
     zbl = {0499.60080},
     url = {http://geodesic.mathdoc.fr/item/MS2_1981__49_166774/}
}