Following Jacobs' death, his incomplete second volume of "Professor Sato's Three Formulae" was finished by his friend Bob De Moor and later the series was continued by two author/illustrator teams alternating albums, the first lead by Jean Van Hamme with Ted Benoît (and later René Sterne, Chantal De Spiegeleer and Antoine Aubin) and the second by Yves Sente with André Juillard. To date, 14 of the 20 albums have been translated and published into English by Cinebook, however it should be noted that the stories are published out of their original order, leading to inconsistencies and plot holes.