The chart of the basic case endings lists the ending for Genitive Plural of #-declension nouns as -ов/-ей. Here is a more detailed description:
  • -oв after plain consonants (e.g. стакђн - стакђнов)
  • -ев/-ёв after /y/ (e.g. музљй - музљев, бћй - боёв)
  • -ћв/-ев after ц (e.g. отљц - отцћв, нљмец - нљмцев)
  • -ей after palatalized consonants and ч щ ш ж (e.g. учќтель - учителљй, мїч - мячљй)