2015EEMUA PUB NO 159-2015 Above ground flat bottomed storage tanks A guide to inspection, maintenance and repair (Edition 4)
2014EEMUA PUB NO 159-2014 Above ground flat bottomed storage tanks A guide to inspection, maintenance and repair (4th Edition)
2011GB/T 18115.14-2010 Chemical analysis methods of rare earth impurities in rare earth metals and their oxides.Part 14:Ytterbium.Determination of lanthanum,cerium,praseodymium,neodymium,samarium,europium,gadolinium,terbium,dysprosium,holmium,erbium,thulium,lutetium and yttrium