@article{lmcs:4860,
    title      = {A Forgotten Theory of Proofs ?},
    author     = {Erwin Engeler},
    url        = {https://lmcs.episciences.org/4860},
    doi        = {10.23638/LMCS-15(3:7)2019},
    journal    = {Logical Methods in Computer Science},
    issn       = {1860-5974},
    volume     = {Volume 15, Issue 3},
    eid        = 7,
    year       = {2019},
    month      = {Jul},
    keywords   = {Mathematics - History and Overview, Mathematics - Logic},
}