PubMed · 4482880
Certification? Direction essential.
Abstract
The source did not provide an abstract. Follow the original record for more information.
Explore related subjects
Keep this discovery
Explore connections, maps & timelines
B Thomas. 1972. Certification? Direction essential.. https://doi.org/10.1016/s0001-2092(07)61957-7
Cite the original work for its findings. Save a collection to share your selection of sources.