Bibtex 中有哪些类型的技术报告？

Question

我将该@techreport条目用于 ISO 标准等文档。例如：

@techreport{ISO-19156,
  type = {Standard},
  key = {ISO 19156:2011},
  year = {2011},
  title = {{Geographic information -- Observations and measurements}},
  volume = {2011},
  address = {Geneva, CH},
  institution = {International Organization for Standardization}
}

关键字type似乎在设置输出类型。除此之外，Standard还可以使用此条目声明哪些其他类型的技术报告？