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It has been shown that quality of components built using selective laser sintering ( SLS ) are strongly affected by the thermal history of the building process .
 quality, components, selective laser sintering, SLS, building process
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 quality, components, selective laser sintering, SLS, building process