Per Year

 @article{modularisation-cacm15,
    address = {New York, NY, USA},
    author = {Parnas, David Lorge},
    doi = {10.1145/361598.361623},
    issn = {0001-0782},
    journal = {Communications of the ACM},
    keywords = {software design, modularity, software engineering, KWIC index, software, modules},
    month = dec,
    number = 12,
    numpages = 6,
    pages = {1053--1058},
    publisher = {Association for Computing Machinery},
    title = {On the Criteria to Be Used in Decomposing Systems into Modules},
    url = {https://dl.acm.org/doi/10.1145/361598.361623},
    urlpdf = {https://dl.acm.org/doi/pdf/10.1145/361598.361623},
    volume = 15,
    year = 1972
}