Napassara Lattikapong, Onvalee Amornleetrakul, Sippawich Kambung 2022. ? Analysis of Crutches System to Select and Guide the Design of Crutches Suitable for Different Sizes of Siege Timber and Development of Tree Crutches. Mathematical Statistician and Engineering Applications. 71, 4 (Nov. 2022), 6436–6448. DOI:https://doi.org/10.17762/msea.v71i4.1232.