@article{CMH_1970__45_139430,
     author = {D.M. Segal},
     title = {On the {Symplectic} {Cobordism} {Ring.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {159--169},
     publisher = {mathdoc},
     volume = {45},
     year = {1970},
     zbl = {0199.26801},
     url = {http://geodesic.mathdoc.fr/item/CMH_1970__45_139430/}
}