no. 3
Cohomologically insignificant degenerations of algebraic varieties
Compositio Mathematica, Tome 42 (1980) no. 3, pp. 279-313 
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     title = {Cohomologically insignificant degenerations of algebraic varieties},
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     pages = {279--313},
     year = {1980},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {42},
     number = {3},
     mrnumber = {607372},
     zbl = {0466.14003},
     language = {en},
     url = {https://www.numdam.org/item/CM_1980__42_3_279_0/}
}
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Dolgachev, Igor. Cohomologically insignificant degenerations of algebraic varieties. Compositio Mathematica, Tome 42 (1980) no. 3, pp. 279-313. https://www.numdam.org/item/CM_1980__42_3_279_0/

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