@article{Lindstrom:1969,
    Author = {Lindstr{\"o}m, Per},
    EPrint = {https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1755-2567.1969.tb00356.x},
    File = {On Extensions of Elementary Logic - 10.1111@j.1755-2567.1969.tb00356.x.pdf},
    Journal = {Theoria},
    Number = {1},
    Pages = {1--11},
    Title = {On Extensions of Elementary Logic},
    URL = {https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1755-2567.1969.tb00356.x},
    Volume = {35},
    Year = {1969},
    bdsk-url-1 = {https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1755-2567.1969.tb00356.x},
    bdsk-url-2 = {https://doi.org/10.1111/j.1755-2567.1969.tb00356.x},
    date-added = {2021-08-10 20:54:57 +0200},
    date-modified = {2021-08-10 21:00:09 +0200},
    doi = {10.1111/j.1755-2567.1969.tb00356.x}
}

@article{Lindstrom:1969, Author = {Lindstr{\"o}m, Per}, EPrint = {https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1755-2567.1969.tb00356.x}, File = {On Extensions of Elementary Logic - 10.1111@j.1755-2567.1969.tb00356.x.pdf}, Journal = {Theoria}, Number = {1}, Pages = {1--11}, Title = {On Extensions of Elementary Logic}, URL = {https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1755-2567.1969.tb00356.x}, Volume = {35}, Year = {1969}, bdsk-url-1 = {https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1755-2567.1969.tb00356.x}, bdsk-url-2 = {https://doi.org/10.1111/j.1755-2567.1969.tb00356.x}, date-added = {2021-08-10 20:54:57 +0200}, date-modified = {2021-08-10 21:00:09 +0200}, doi = {10.1111/j.1755-2567.1969.tb00356.x} }