Infinite terms and a system of natural deduction
Compositio Mathematica, Tome 24 (1972) no. 1, pp. 93-103. 
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     number = {1},
     year = {1972},
     mrnumber = {300860},
     zbl = {0237.02006},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1972__24_1_93_0/}
}
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Martin-Löf, Per. Infinite terms and a system of natural deduction. Compositio Mathematica, Tome 24 (1972) no. 1, pp. 93-103. http://archive.numdam.org/item/CM_1972__24_1_93_0/

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