@article{CG_1998___28-29_197_0,
     author = {Thế~Th\`anh, H\`an},
     title = {The {pdfTeX} {Program}},
     journal = {Cahiers GUTenberg},
     pages = {197--210},
     publisher = {Association GUTenberg},
     number = {28-29},
     year = {1998},
     language = {en},
     url = {http://www.numdam.org/item/CG_1998___28-29_197_0/}
}