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This paper focuses on the coauthor effect in different types of publications,usually not equally respected in measuring research impact. {\it A priori}unexpected relationships are found between the total coauthor core value,$m_a$, of a leading investigator (LI), and the related values for theirpublications in either peer review journals ($j$) or in proceedings ($p$). Asurprisingly linear relationship is found: $ m_a^{(j)} + 0.4\;m_a^{(p)} =m_a^{(jp)} $. Furthermore, another relationship is found concerning the measureof the total number of citations, $A_a$, i.e. the surface of the citationsize-rank histogram up to $m_a$. Another linear relationship exists :$A_a^{(j)} + 1.36\; A_a^{(p)} = A_a^{(jp)} $. These empirical findingscoefficients (0.4 and 1.36) are supported by considerations based on anempirical power law found between the number of joint publications of an authorand the rank of a coauthor. Moreover, a simple power law relationship is foundbetween $m_a$ and the number ($r_M$) of coauthors of a LI: $m_a\simeqr_M^{\mu}$; the power law exponent $\mu$ depends on the type ($j$ or $p$) ofpublications. These simple relations, at this time limited to publications inphysics, imply that coauthors are a "more positive measure" of a principalinvestigator role, in both types of scientific outputs, than the Hirsch indexcould indicate. Therefore, to scorn upon co-authors in publications, inparticular in proceedings, is incorrect. On the contrary, the findings suggestan immediate test of coherence of scientific authorship in scientific policyprocesses.

Coherent measures of the impact of co-authors in peer review journals and in proceedings publications