@article{Watanabe1960, 
     author = "Watanabe, H.", 
     doi = "10.1109/TCT.1960.1086675", 
     issn = "0096-2007", 
     journal = "IRE Transactions on Circuit Theory", 
     number = "3", 
     pages = "296--302", 
     title = "A Computational Method for Network Topology", 
     volume = "7", 
     year = "1960", 
}

Problems: 491