@incollection{Qin20, author = {Xiaofeng Qin}, title = {Contact Strength of Material}, booktitle = {Strength of Materials}, publisher = {IntechOpen}, address = {Rijeka}, year = {2020}, editor = {H├ęctor Jaramillo S. and Julian Arnaldo Avila and Can Chen}, chapter = {4}, doi = {10.5772/intechopen.90228}, url = {https://doi.org/10.5772/intechopen.90228} }