@article{Percival1953, 
     author = "Percival, W S", 
     doi = "10.1049/pi-3.1953.0033", 
     journal = "Proceedings of the IEE - Part III: Radio and Communication Engineering", 
     number = "65", 
     pages = "143--150", 
     title = "The solution of passive electrical networks by means of mathematical trees", 
     volume = "100", 
     year = "1953", 
}

Problems: 471