10.1184/R1/6479039.v1 Richard James Duffin Richard James Duffin Optimum heat transfer and network programming Carnegie Mellon University 1967 Heat Transmission. Network analysis (Planning) Nonlinear programming. 1967-01-01 00:00:00 Journal contribution https://kilthub.cmu.edu/articles/journal_contribution/Optimum_heat_transfer_and_network_programming/6479039 Mathematics Technical Report