DOC: add link to ComPWA/ampform#67

Author: redeboer

docs/report/026.ipynb

@@ -48,7 +48,7 @@
     "^^^\n",
     "This report investigates and reproduces the Riemann sheets shown in [Fig. 50.1](https://pdg.lbl.gov/2023/reviews/rpp2023-rev-resonances.pdf#page=2) and [50.2](https://pdg.lbl.gov/2023/reviews/rpp2023-rev-resonances.pdf#page=4) of the PDG. The lineshape parametrization is directly derived with the $K$-matrix formalism. The transition from the first physical sheet to the second unphysical sheet is derived using analytic continuation.\n",
     "+++\n",
-    "🚧 [compwa.github.io#204](https://github.com/ComPWA/compwa.github.io/pull/204)\n",
+    "🚧 [ampform#67](https://github.com/ComPWA/ampform/issues/67)\n",
     ":::\n",
     "::::"
    ]

docs/report/027.ipynb

@@ -46,7 +46,9 @@
     ":::{card}  Visualization of the Riemann sheets for the two-channel $T$-matrix with one resonance pole\n",
     "TR-027\n",
     "^^^\n",
-    "Following **[TR-026](./026.ipynb)**, the Riemann sheets for the amplitude calculated within the $K$ matrix formalism for the two-channel case are visualized. For that the method of transitioning from the first physical sheet to the unphysical sheets is expanded to the two dimensional case according to [Eur. Phys. J. C (2023) 83:850](https://juser.fz-juelich.de/record/1017534/files/s10052-023-11953-6.pdf?version=1) to also visualize the third and the fourth unphysical sheet.   \n",
+    "Following **[TR-026](./026.ipynb)**, the Riemann sheets for the amplitude calculated within the $K$-matrix formalism for the two-channel case are visualized. The method of transitioning from the first physical sheet to the unphysical sheets is extended to the two dimensional case using [Eur. Phys. J. C (2023) 83:850](https://juser.fz-juelich.de/record/1017534/files/s10052-023-11953-6.pdf) in order to visualize the third and the fourth unphysical sheet.\n",
+    "+++\n",
+    "🚧 [ampform#67](https://github.com/ComPWA/ampform/issues/67)\n",
     ":::\n",
     "::::"
    ]