@article{CM_1977__35_2_197_0,
     author = {Viehweg, Eckart},
     title = {Canonical divisors and the additivity of the {Kodaira} dimension for morphisms or relative dimension one},
     journal = {Compositio Mathematica},
     pages = {197--223},
     publisher = {Noordhoff International Publishing},
     volume = {35},
     number = {2},
     year = {1977},
     mrnumber = {569690},
     zbl = {0357.14014},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1977__35_2_197_0/}
}