@article{article,
title = {The relation of the colour and vitamin A content of butter to the nature of the ration fed. 1. Influence of the ration on the yellow colour of the butter. 2. The carotenoid and vitamin A contents of the butter},
author = {Watson, S.J., E.Al.},
year = {1934},
journal = {Biochem. J},
volume = {28},
pages = {1076-85},
howpublished = "\url{https://eurekamag.com/research/013/580/013580197.php}"
}