by Webber, Roger.
by Hannon, Bruce | Ruth, Matthias.
by Diekmann, Odo | Britton, Tom | Heesterbeek, Hans.
by Marchuk, Guri I.
by Shetty, N | Andrews, J | Tang, J. W.
by Brauer, Fred | Castillo-Chavez, Carlos.
by Tumbe, Chinmay.
by Bjørnstad, Ottar N.
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