Per Year

 @article{turing-ptrsl237,
    author = {Turing, Alan Mathison},
    journal = {Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences},
    month = aug,
    number = 641,
    pages = {37--72},
    title = {The Chemical Basis of Morphogenesis},
    volume = 237,
    year = 1952
}